Page 1

JJI-Joists TECHNICAL MANUAL FOURTH EDITION DECEMBER 2013

A Tradition of Innovation

www.jamesjones.co.uk


CONTENTS

01

INTRODUCTION

02

THE SYSTEM

03

GENERAL INFORMATION

04

ENVIRONMENTAL INFORMATION

05

JJI-JOISTS

08

SERVICE HOLES IN JJI-JOISTS

09

FIRE AND DURABILITY

10

ACOUSTIC PERFORMANCE AND SCHEDULE OF WEIGHTS

11

JJ-BEAM AND JJ-RIM (GLULAM)

14

JJ-BEAM AND JJ-RIM FIXING DETAILS

17

METALWORK

18

FLOOR DESIGN

19

DOMESTIC INTERMEDIATE AND APARTMENT FLOOR SPAN TABLES

20

HEALTH AND SAFETY – TEMPORARY BRACING

21

SITE STORAGE AND RESTRICTIONS

22

INDICATIVE FLOOR DETAILING – F DETAILS

31

ROOF DESIGN

32

JJI-JOIST FLAT ROOFS

33

JJI-JOIST PITCHED RAFTERS

35

INDICATIVE ROOF DETAILING – R DETAILS

38

WALL DESIGN

39

JJI-JOIST THERMAL PERFORMANCE

40

INDICATIVE WALL DETAILING – W DETAILS

41

GLOSSARY

We currently offer a face to face seminar on Engineered Wood Products for Modern Methods of Construction. These are offered for larger Construction Practises throughout the UK and Ireland. Please visit our website to request a face to face seminar and find out how to take our online CPD Seminar.

Whilst every effort was made to ensure the accuracy of this publication at the time of printing James Jones & Sons cannot be held responsible for changes to Building Regulations, NHBC Standards etc. For the most up-to-date information please visit our website: www.jamesjones.co.uk


INTRODUCTION

INTRODUCTION TO JAMES JONES & SONS

THE COMPANY

James Jones & Sons is the UK’s leading manufacturer of I-Joists based at its Timber Systems Division in Forres, Morayshire. The Timber Systems Division prides itself on building strong partnerships throughout the supply chain, concentrating on its core values of quality and service.

James Jones & Sons is one of the largest suppliers of British Timber in the UK today. The company’s sawmills are strategically placed to take advantage of the increasing supply of saw logs being produced from post war plantations. These are bought from both private and state owned forests as well as woodlands owned and managed by the company.

JJI-Joists are manufactured under the strictest quality and environmental standards, and this new edition of the Technical Manual outlines the applications and versatility of JJI-Joists. The range is manufactured to UK sizes and specifications, and is available on a Just-In-Time basis from a comprehensive stock holding. The entire production and distribution process has been audited by third party accreditation systems, and a Carbon Footprint assessment using a Life Cycle Assessment approach has been carried out to ensure full sustainability and environmental compliance. Through the use of our bespoke, dedicated software programmes, JJI-Joists can be specified and engineered to exacting standards, for floor, wall and roof applications of both domestic and commercial buildings. JJI-Joists are part of a comprehensive building system and are complemented by glulam and metal connectors and this manual highlights their use and combinations. JJI-Joists are sold through dedicated distributors, merchants, timber frame kit manufacturers and roof truss manufacturers situated across the UK, Ireland and mainland Europe. These combined resources, backed up by dedicated James Jones & Sons personnel, ensure that the design, specification and supply of JJI-Joists is seamless and of the highest quality.

FAMILY CONCERN James Jones & Sons is a real family business. Even with a staff of over 500 it has the culture of a family firm. Like any good family, the company cares for its members. That concern extends to whole communities in rural areas where the company is a major employer. There is also an equal concern for customer satisfaction. The company’s mission is to maintain the highest standards of quality and service in the industry. CUTTING EDGE The company strives to maintain its competitive advantages. Variety of product is one. Wood is harvested and processed for specific markets and end uses such as construction, palletwood, packaging and fencing. James Jones & Sons has a team of highly trained professionals who look after the purchasing and harvesting of round timber, making sure that the right logs go to the right mill where they can be processed to best advantage. Good relationships with forest owners are vital and in most cases are of many years standing thus providing the right background for the purchase of our raw material. Quality comes from modern sawmills staffed by experienced people. James Jones & Sons is fortunate in having many people who are experts in their field and who know about and understand wood. This ensures the quality of our products is maintained at the highest level. THE FUTURE

ROOTS Mr James Jones started trading in timber and allied products in the middle of the nineteenth century. Since being incorporated in 1905, James Jones & Sons has grown both organically and by acquisition.

• Pallet Manufacture • Pallet repair • JJI-Joists

• Sawmilling • Harvesting

United Box • Partner in wood product manufacturing

• Pallet Manufacture • Pallet repair • Joint venture in lumber business: Canada/USA

As well as investing in state-of-the-art technology for our traditional sawmilling business, James Jones & Sons has taken the strategic decision to invest in and develop more innovative products. The JJI-Joist, manufactured by James Jones & Sons, Timber Systems Division, is the direct result of one of the new technologies that has been embraced by the company. Following the successful launch of the JJI-Joist range in 1999 the Timber Systems Division has added a fully automated second production line along with highly efficient finger jointing and web profiling lines to keep up with demand. In addition to the production investment, the Division has also set up a technical and design office to provide a full design and engineering support service.

1


2

THE SYSTEM

THE JJI-JOIST SYSTEM

SOFTWARE

The JJI-Joist system relies on a unique combination of engineered products designed to compliment each other and deliver outstanding performance.

The JJI-Joist system is fully supported by three Windows™ based software packages written in the UK to provide fast and cost effective design solutions for today’s construction industry.

JJI-JOISTS The workhorse of the system, a versatile light weight structural member ideal for floor joists, rafters, purlins and wall studs.

These packages are regularly updated to ensure compliance with ever changing Building Regulations and Codes of Practice, each new version incorporating new features and developments to help the designer maximise the benefits of the system. JoistMaster is an extremely powerful beam design tool, which enables the specifier to quickly assess the most cost effective joist solution, tailored to his/her particular design requirements, and provide a calculation printout suitable for local authority approval. JoistMaster is freely available to download from www.jamesjones.co.uk

For more information see page 5

JJ-BEAM AND JJ-RIM (GLULAM) For the most demanding applications, high strength and stiffness combined with dimensional stability make this the ideal choice for heavily loaded members in floors, roofs and walls.

FloorMaster is a comprehensive floor design and layout package allowing trained designers to quickly and accurately produce detailed layout drawings, installation details, material call-offs, calculations and design quotations for any building footprint. FloorMaster export files allow quick and easy intergration into third party CAD and BIM software.

For more information see page 11

METALWORK A comprehensive range of connectors designed specifically for the JJI-Joist system are available from two approved suppliers.

OptiMaster is a stock optimisation package designed to work with the output from FloorMaster.

For more information see page 17


GENERAL INFORMATION

DISTRIBUTION

APPROVALS

The JJI-Joist system is available from a network of builders/ timber merchants and timber frame and engineered timber system manufacturers providing local, quality expertise.

JJI-Joists are an accepted building material within the construction industry thanks to third party certification from BM TRADA European Technical Approval.

BM TRADA ETA is recognised by NHBC, Local Authority Building Control and others.

These distributors are trained to use our software and understand the correct use and specification of our products. This training is ongoing and ensures our distributors have the skills required to provide an efficient, cost-effective, JJI-Joist solution. Distributor details are www.jamesjones.co.uk

available

to

download

from

James Jones & Sons are founder members of the Structural Timber Association, formerly UK Timber Frame Association (UKTFA) and were involved in the drafting of the Code of Practice for the Design of Engineered Wood Products which provides guidance on the design of structures using I-Joists.

JJI-JOISTS STOCKISTS & TECHNICAL SUPPORT Regional Support Stephen Stewart 07500 016773 21 09 25 29 05 Greshop Ind. Estate, Forres. IV36 2GW Tel +44 1309 671111

10 24

23

19

JJI-Joist Distributor

17

JJI-Joist Distributor/ Cassette Manufacturer Timber Frame Kit Supplier

13 06

07

12

QUALITY CONTROL AND QUALITY ASSURANCE

Regional Support Lynford Chambers 07879 888216

02

03 14

20 18

Regional Support Peter Barker 07977 283781

11 04

22

08 31 15 26

01

28

France & Belgium

30 16

33 34 35

27

Regional Support Mark Tilston 07977 283756

32

The success of a manufactured product is often determined by its quality. It is for this reason the James Jones & Sons, Timber Systems Division maintains a thorough Quality Management System which enables us to achieve our goal of producing a consistent and uniform product of exceptionally high standards. JJI-Joists are manufactured under a Quality Assurance scheme which complies with ISO 9001:2008 and CE marking.

CUSTOMER SERVICES AND TECHNICAL SUPPORT James Jones & Sons, Timber Systems Division has a highly trained team of Technical, Engineering and Sales personnel providing UK and Irish national coverage to ensure simple, safe and quick installation of JJI-Joist systems. A summary of the services offered is given below. •

Pre and after sales assistance

Engineering support

Product training courses

Software and design training

Building site training

Full design and engineering service

RESEARCH AND DEVELOPMENT James Jones & Sons are proud of their tradition of innovation and product development. Central to the success of the Timber Systems Division, is an ongoing research and development programme designed to deliver new applications for existing products and to improve the performance of all products to keep pace within the ever changing Building Regulations and Codes of Practice. In addition to this, raw material sourcing and production methods and technology are continuously reviewed and improved to maximise product quality and efficiency.

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4

ENVIRONMENTAL INFORMATION

ENVIRONMENTAL MANAGEMENT

CARBON ACCOUNTING & LIFE CYCLE ASSESSMENT (LCA)

Environmental considerations are a critical factor in the production of JJI-Joists. Our certified ISO 14001:2004 Environmental Management System has enabled the company to target key areas to reduce the impacts of our activities on the environment.

Our third key sustainability element is our PAS 2050:2011 carbon accounting model which is assured by Ecometrica, the UK leading Greenhouse Gas specialists, on an annual basis. Not only does this enable us to measure, compare and reduce our key “trigger” impacts at each stage of the production process but our overall carbon negative footprint can be applied to individual house design and supply contract volumes.

The introduction of biomass heating systems utilising wood co-products, the continuous commitment to waste minimisation, energy savings and the recycling of materials used, ensures the delivery of JJI-Joists with the smallest environmental footprint possible. This in-built consideration of the environment in our current and future plans has shaped our purchasing policy to choose only those technologies that can prevent pollution and improve our environmental performance year on year. The competencies of all our employees enables our environmental objectives to be implemented and exceeded every year. A safe, quality driven and improvement culture ensures environmental performance is always present at the very centre of all our activities. As environmental considerations affect the whole JJI-Joist supply chain, we are engaged in continuous dialogue with our suppliers and distributors to minimise potential impact. Our commitment to ISO 14001:2004 from start-up, not only guarantees our compliance with all current and forthcoming legislation but delivers a JJI-Joist with excellent and continually improving environmental credentials. SUSTAINABLE TIMBER SOURCING & CHAIN OF CUSTODY The UK Government policy on timber purchasing has stated that timber should only be purchased from legal and sustainable sources. Increasingly, both public and private sectors are encouraged to follow this policy. Sustainable timber supply has always been integral to the manufacture of our engineered wood products. Consequently JJI-Joists are able to be specified as FSC Certified. All product claims are independently verified by BM TRADA Certification on an on-going basis. Within the James Jones Group and via our trade body Confor, we work closely with both FSC & PEFC to ensure any future requirements are complied with. James Jones Harvesting Division and our Timber Systems Division Chain of Custody systems enable all clients to have full traceability to source to guarantee supply chain legality and sustainability. Consequently our JJI-Joists are both EUTR compliant and are derived from known and trusted sources.

Our LCA measurements enable our environmental performance profile to be measured and improved upon by assessing all environmental impacts associated with the sourcing, transport and manufacture of our product i.e. from the forest to the end user. JJI-Joists can help to mitigate climate change as timber acts as a carbon sink. Carbon dioxide (CO2) is absorbed by trees and used to create wood. This CO2 is only released back into the environment when the joists come to the end of their lifetime. As only sustainable timber is used for the production of JJI-Joists, other trees are planted to replace harvested ones immediately, closing the CO2 cycle and contributing to keep a constant or even increasing volume of CO2 locked away from the atmosphere where it cannot contribute to climate change. Increasingly supply chain partnerships are being developed with key clients to enable our quantified carbon negative supply to support and contribute to downstream Corporate Social Responsibility (CSR) commitments Improved supply logistics, new resin formulations and improved biomass heating efficiencies are recent examples of targeted and quantifiable improvements within the life-cycle performance of our JJI-Joists Our carbon accounting complements the generic schemes used to quantify environmental impacts of products such as BRE environmental profiles. Scores for this scheme are used in the assessment process of 'The Code for Sustainable Homes' in England and Wales and 'Ecohomes' in Scotland. Timber I-joists such as JJI-Joists achieve the best scores in this scheme (A+) and therefore can help specifiers to achieve their “Zero Carbon” construction goals. THERMAL PERFORMANCE Other advantages of using JJI-Joists are their superior strength-to -weight ratio and readily available deep sections (up to 450mm) when compared with solid timber. In this way more insulation can be used within the building envelope and significant savings in heating can be achieved. The thin web used in JJI-Joists contributes to minimise repeated thermal bridging in timber frame structures enabling JJI-Joists to achieve better U-values than solid timber. This property makes JJI-Joists ideal as a structural member in roofs and walls in low energy buildings.

BMT-PEFC-0105

The UK government has already expressed its preference for better insulated and airtight building envelopes as a way to reduce energy consumption. The adoption of insulated structures using JJI-Joists and designed according to principles such as Passivhaus can significantly reduce the energy requirements for heating and this approach will be essential to achieve a truly Zero Carbon House.


JJI-JOISTS

INTRODUCTION

JJI-JOIST RANGE AND TOLERANCES

A JJI-Joist is a composite engineered timber joist, combining 45mm deep high-grade finger jointed softwood flanges (C24) with a 9mm thick oriented strand board (OSB/3) web. Four flange widths are available at 47, 63, 72 and 97mm wide.

JJI-Joists are available in a comprehensive range of sizes, designed specifically for the UK market. JJI-Joists are available in lengths of up to 12m.

COMPOSITION

JJI-JOIST FLANGE SIZES

A+

B+

C

D 45mm

Softwood flanges

9mm OSB/3 Web

High tensile and compressive strength is used to carry the bending loads which are greatest at the top and bottom of the section

High shear strength is used to carry the shear loads which are greatest at the mid depth of the section

45mm 47mm

These materials have different specific properties and by combining the two materials in this way to form a composite section you can use the strengths of each one where it is needed most. This, results in the new section outperforming the individual materials that it is made from (the sum is greater than its parts) making it more structurally efficient. Using advanced technology these components are combined to produce an innovative alternative to conventional construction timber with many additional advantages. ADVANTAGES JJI-Joists are designed to give a superior strength to weight ratio enabling the manufacture of longer and lighter structural members. The JJI-Joist, with a softwood flange: •

Is capable of spanning longer distances

Is easier to handle

Is easier to fix and nail

Is less prone to splitting

Is quicker to install

Is extremely stable

Reduces building maintenance

Provides a less complex design solution

Is simple to specify using superior software

Has Part E compliant details available

Is FSC/PEFC accredited

Has very low embodied energy

Has independently assured carbon accounting to PAS2050:2011

Joist Depth (mm)

63mm

72mm

97mm

JJI-Joist Flange Sizes A+ 47mm

145

195

B+ 63mm

C 72mm

D 97mm

Timber Grade C24 C24

220

C24

235

C24

245

C24

300

C24

350

C24

400

C24

450

C24

Table 1. JJI-Joist Product Range Member Dimension

Tolerance (mm)

Overall Joist Length

+/-3.0

Overall Joist Depth

+/-2.0

Flange Thickness/Depth

+/-2.0

Web Thickness

+/-0.8

Table 2. JJI-Joist Manufacturing Tolerance JJI-JOIST IDENTIFICATION AND MARKING JJI-Joists are identified by an alpha numeric code that specifies the joist depth, flange size and flange grade (see example below). This code is printed at regular intervals along the centre line of the web along with the production time and date to facilitate on-site identification and traceability. ID

JJI195 B+24

DD.MM.YY

James C24 Jones Timber I-Joist Flange 195mm Deep ‘B+’ Flange 63mm Wide

Production Batch Code

In addition to the above information, the clear warning 'DO NOT CUT FLANGES' is printed along the length of each flange as a precaution against creating unnecessary structural damage.

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JJI-JOISTS

JJI-JOIST PROPERTIES It is possible to design JJI-Joist structures using either a Permissible Stress Design Code (BS 5268-2) or a Limit State Design Code (EN1995-1-1/Eurocode 5). Each code requires properties that are derived and presented in a different way.

Joist Type

Permissible stress design properties, intended for use with BS 5268-2 and characteristic capacities, intended for use with Eurocode 5, can be found in BM TRADA ETA 10/0335.

Depth

Bending moment capacity M

EI

V

GA

N/S

W/S

N/S

W/S

N/S

W/S

W

(mm)

(kNm)

(109 Nmm2)

(kN)

(106N)

(kN)

(kN)

(kN)

(kN)

(kN)

(kN)

(kg/m) 2.26

Bending stiffness

Shear strength capacity

Shear stiffness

Intermediate bearing capacity – minimum 89mm bearing length

End bearing capacity – minimum 45mm bearing length

End bearing capacity – minimum 89mm bearing length

Weight per metre length

JJI 145 A+

145

1.64

139.6

3.12

0.550

5.36

6.92

2.78

3.60

3.38

4.55

JJI 195 A+

195

2.40

305.1

3.48

0.907

5.66

7.95

2.78

5.27

3.38

5.27

2.56

3.05

424.7

3.87

0.907

7.18

9.28

3.73

5.27

4.31

6.10

3.21

JJI 195 B+ JJI 195 C

3.40

505.6

4.07

0.907

8.21

10.61

4.22

5.51

4.31

6.97

3.57

JJI 195 D

4.32

740.5

4.60

0.907

8.73

12.69

4.22

7.42

4.31

9.39

4.58

JJI 220 A+

220

JJI 220 B+

2.79

407.4

3.71

1.086

6.25

7.95

2.96

5.27

3.45

5.27

2.70

3.54

588.5

4.09

1.086

7.18

9.28

3.73

5.27

4.31

6.10

3.35

JJI 220 C

3.95

667.3

4.29

1.086

8.21

10.61

4.22

5.51

4.31

6.97

3.72

JJI 220 D

5.02

941.3

4.81

1.086

8.73

12.69

4.22

7.42

4.31

9.39

4.73

JJI 235 A+

235

JJI 235 B+

3.03

472.4

3.85

1.193

6.60

7.95

3.13

5.27

3.62

5.27

2.79

3.84

678.1

4.22

1.193

7.18

9.28

3.73

5.27

4.31

6.10

3.44

JJI 235 C

4.28

771.3

4.42

1.193

8.21

10.61

4.22

5.51

4.31

6.97

3.80

JJI 235 D

5.44

1088.0

4.95

1.193

8.73

12.69

4.22

7.42

4.31

9.39

4.82

JJI 245 A+

245

JJI 245 B+

3.19

518.0

3.95

1.265

6.84

7.95

3.24

5.27

3.72

5.27

2.85

4.04

737.2

4.32

1.265

7.18

9.28

3.73

5.27

4.31

6.10

3.50

JJI 245 C

4.50

844.4

4.52

1.265

8.21

10.61

4.22

5.51

4.31

6.97

3.86

JJI 245 D

5.72

1195.4

5.04

1.265

8.73

12.69

4.22

7.42

4.31

9.39

4.87

JJI 300 A+

300

JJI 300 B+

4.09

816.3

4.54

1.658

6.17

7.95

3.13

5.27

3.86

5.27

3.17

5.17

1121.9

4.88

1.658

7.18

9.28

3.73

5.27

4.14

6.10

3.82

JJI 300 C

5.75

1319.5

5.07

1.658

8.21

10.61

3.95

5.51

4.14

6.97

4.18

JJI 300 D

7.29

1899.0

5.59

1.658

8.73

12.69

3.95

7.42

4.14

9.39

5.20

*JJI 350 A+

4.93

1113.5

5.11

2.015

6.17

6.92

3.13

3.60

3.18

4.55

3.46

*JJI 350 B+

6.21

1484.6

5.44

2.015

7.18

9.28

3.35

4.82

3.18

6.10

4.11

JJI 350 C

6.90

1899.6

5.62

2.015

8.21

10.61

3.35

5.51

3.57

6.97

4.48

JJI 350 D

8.74

2647.6

6.12

2.015

8.73

12.69

3.35

7.42

3.57

9.39

5.49

*JJI 400 A+

350

5.80

1521.6

5.71

2.373

6.17

6.92

2.69

3.60

3.02

4.55

3.76

*JJI 400 B+

7.28

2023.3

6.02

2.373

7.18

9.28

2.69

4.82

3.02

6.10

4.40

JJI 400 C

8.08

2673.0

6.19

2.373

8.21

10.61

2.69

5.51

3.32

6.97

4.77

JJI 400 D

10.20

3428.0

6.68

2.373

8.44

12.69

2.69

7.42

3.32

9.39

5.78

*JJI 450 A+

400

6.68

1999.3

6.32

2.730

6.17

6.92

2.22

3.60

3.02

4.55

4.05

*JJI 450 B+

450

8.36

2651.5

6.61

2.730

7.04

9.09

2.22

4.82

3.02

6.10

4.70

*JJI 450 C

9.27

3018.4

6.78

2.730

7.04

9.42

2.22

5.51

3.02

6.97

5.06

JJI 450 D

11.69

4170.4

7.26

2.730

7.04

12.69

2.37

7.42

3.02

9.39

6.07

Table 3. Long Term Permissible Design Properties for JJI-Joists (BS 5268-2) Notes for Table 3: 1.

Do not mix values from Table 3 and Table 4

2.

Values given are for long term load durations only (k3=1.0)

3.

Values are applicable to joists in Service Class 1 only

4.

N/S: no web stiffeners required, W/S: web stiffeners required

5.

All strength properties are given for JJI-Joists used in load sharing situations. Non-load sharing values can be obtained as follows: Moment, Shear and Bearing Capacity – Divide the tabulated value by 1.1 (k8 = 1.1)

6.

Minimum end bearing length = 45mm, minimum intermediate bearing length = 89mm

7.

End bearing capacities for bearing lengths between 45-89mm can be found by linear interpolation

8.

The long term uniformly distributed bottom flange pull-off load is 5.5kN/m

9.

For Residential Floors within Self Contained Dwellings with a maximum imposed load of 1.5kN/m2, the JJI-Joist Moment, Shear and Bearing capacities can be multiplied by 1.12 (kdom= 1.12)

10. * The top and bottom flanges of these sizes require continuous lateral restraint at a maximum of 300mm centres unless a lateral buckling check has been performed


JJI-JOISTS

Depth

Bending moment capacity M

EI

V

GA

N/S

W/S

N/S

W/S

N/S

W/S

W

(mm)

(kNm)

(109 Nmm2)

(kN)

(106N)

(kN)

(kN)

(kN)

(kN)

(kN)

(kN)

(kg/m)

JJI 145 A+

145

3.89

139.6

9.54

0.748

16.37

16.37

8.50

8.50

10.33

10.76

2.26

JJI 195 A+

195

5.67

305.1

10.64

1.234

16.37

16.37

8.50

8.50

10.31

10.76

2.56

JJI 195 B+

7.20

424.7

11.82

1.234

21.94

21.94

11.39

11.39

13.16

14.42

3.21

JJI 195 C

8.03

505.6

12.44

1.234

25.07

25.07

12.90

13.02

13.16

16.48

3.57

JJI 195 D

10.22

740.5

14.06

1.234

26.66

30.00

12.90

17.54

13.16

22.20

4.58

Joist Type

JJI 220 A+

Shear strength capacity

Shear stiffness

Intermediate bearing capacity – minimum 89mm bearing length

End bearing capacity – minimum 45mm bearing length

End bearing capacity – minimum 89mm bearing length

Weight per metre length

6.60

407.4

11.33

1.477

16.37

16.37

8.50

8.50

10.31

10.76

2.70

JJI 220 B+

8.37

588.5

12.48

1.477

21.94

21.94

11.39

11.39

13.16

14.42

3.35

JJI 220 C

9.32

667.3

13.09

1.477

25.07

25.07

12.90

13.02

13.16

16.48

3.72

JJI 220 D

11.86

941.3

14.71

1.477

26.66

30.00

12.90

17.54

13.16

22.20

4.73 2.79

JJI 235 A+

220

Bending stiffness

7.17

472.4

11.77

1.623

16.37

16.37

8.50

8.50

10.31

10.76

JJI 235 B+

235

9.08

678.1

12.90

1.623

21.94

21.94

11.39

11.39

13.16

14.42

3.44

JJI 235 C

10.11

771.3

13.51

1.623

25.07

25.07

12.90

13.02

13.16

16.48

3.80

12.85

1088.0

15.12

1.623

26.66

30.00

12.90

17.54

13.16

22.20

4.82

7.54

518.0

12.08

1.720

16.37

16.37

8.50

8.50

10.31

10.76

2.85

JJI 245 B+

9.55

737.2

13.19

1.720

21.94

21.94

11.39

11.39

13.16

14.42

3.50

JJI 245 C

10.64

844.4

13.80

1.720

25.07

25.07

12.90

13.02

13.16

16.48

3.86

13.52

1195.4

15.40

1.720

26.66

30.00

12.90

17.54

13.16

22.20

4.87

9.67

816.3

13.86

2.255

16.37

16.37

8.50

8.50

10.31

10.76

3.17

JJI 300 B+

12.21

1121.9

14.91

2.255

21.94

21.94

11.39

11.39

12.64

14.42

3.82

JJI 300 C

13.58

1319.5

15.49

2.255

25.07

25.07

12.08

13.02

12.64

16.48

4.18

JJI 300 D

17.22

1899.0

17.07

2.255

26.66

30.00

12.08

17.54

12.64

22.20

5.20

11.66

1113.5

15.61

2.741

16.37

16.37

8.50

8.50

9.72

10.76

3.46

*JJI 350 B+

14.68

1484.6

16.60

2.741

21.94

21.94

10.22

11.39

9.72

14.42

4.11

JJI 350 C

16.31

1899.6

17.16

2.741

25.07

25.07

10.22

13.02

10.91

16.48

4.48

JJI 235 D JJI 245 A+

245

JJI 245 D JJI 300 A+

*JJI 350 A+

300

350

JJI 350 D

20.65

2647.6

18.70

2.741

26.66

30.00

10.22

17.54

10.91

22.20

5.49

13.70

1521.6

17.43

3.227

16.37

16.37

8.20

8.50

9.23

10.76

3.76

*JJI 400 B+

17.20

2023.3

18.37

3.227

21.94

21.94

8.20

11.39

9.23

14.42

4.40

JJI 400 C

19.09

2673.0

18.91

3.227

25.07

25.07

8.20

13.02

10.15

16.48

4.77

*JJI 400 A+

400

JJI 400 D

24.12

3428.0

20.41

3.227

25.79

30.00

8.20

17.54

10.15

22.20

5.78

15.79

1999.3

19.31

3.713

16.37

16.37

6.79

8.50

9.23

10.76

4.05

*JJI 450 B+

19.77

2651.5

20.20

3.713

21.50

21.50

6.79

11.39

9.23

14.42

4.70

*JJI 450 C

21.92

3018.4

20.72

3.713

21.50

22.27

6.79

13.02

9.23

16.48

5.06

JJI 450 D

27.64

4170.4

22.18

3.713

21.50

30.00

6.79

17.54

9.21

22.20

6.07

*JJI 450 A+

450

Table 4. Characteristic Capacities for JJI-Joists (Eurocode 5) Notes for Table 4:

Notes for Table 4:

1.

Do not mix values from Table 3 and Table 4

4.

2.

N/S: no web stiffeners required, W/S: web stiffeners required

3.

Minimum end bearing length = 45mm, minimum intermediate bearing length =

Advice on choosing appropriate partial factors for limit state design can be found in BM TRADA ETA-10/0335

5.

89mm

* The top and bottom flanges of these sizes require continuous lateral restraint at a maximum of 300mm centres unless a lateral buckling check has been performed

JJI-JOIST VERTICAL LOAD CAPACITIES

6.

All strength properties are given for JJI-Joists used as non-systems. For joists acting as a system multiply Moment, Shear and Bearing by 1.1 (ksys=1.1)

JJI Joist Depth

Permissible long term load per metre run (kN/m)

Characteristic load per metre run (kN/m)

195

25.0

75.0

220

20.0

60.0

235

20.0

60.0

245

19.0

57.0

300

17.0

51.0

350

13.7

41.1

400

10.7

32.1

450

10.3

30.9

JJI POINT LOADS AND UDL UDL P

Table 5. JJI-Joist Vertical Loads Notes for Table 5: 1.

Permissible loads are given for long term load duration

2.

Point loads (P) can be calculated using the following expression where Lb is the

3.

Allowance may be made for load spreading of sole plates and bottom rails

contact length of the applied load in mm. P = UDL x (Lb+60)/1000

Lb

7


8

SERVICE HOLES IN JJI-JOISTS

JJI-JOIST HOLE INSTALLATION GUIDE: CIRCULAR, SQUARE AND RECTANGULAR HOLES Service holes MUST NOT BE CUT in the JJI-Joist flange. The maximum size of a service hole that can be cut in the web of a JJI-Joist at a particular location depends on the specific load configuration on the joist. Because of this it is not possible to provide general rules that apply to all cases.

Hole Size (mm)

Joist Depth (mm)

Joist Span (mm)

+

145

1000 1500 2000 2500 3042 2500 3000 3500 4000 4343 3000 3500 4000 4500 4675 3000 3500 4000 4500 4855 3000 3500 4000 4500 4970 3500 4000 4500 5000 5577

300 300 300 342 613 300 300 300 300 321 300 300 300 300 319 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300

195

220

235

245

300

The table below gives the minimum required distance, L (mm), from inside face of support to nearest edge of hole for uniformly loaded, simply supported joists under standard domestic loading of 0.75kN/m2 dead load and 1.5kN/m2 imposed load at up to 600mm centres. Where this is not the case, the hole(s) can be assessed using the JoistMaster software. Contact your Distributor for advice.

50

75

100

+

300 300 300 300 504 300 300 300 329 500 300 300 300 454 541 300 300 300 349 526 300 300 300 300 504 300 300 300 300 300

300 300 300 450 622 300 300 379 629 717 300 300 300 547 725 300 300 300 481 716 300 300 300 300 551

125

+

300 300 300 539 710 300 309 559 809 896 300 300 518 768 946 300 300 476 726 961 300 300 348 598 886

300 300 300 548 719 300 348 598 848 935 300 323 573 823 1000 300 300 539 789 1024 300 300 445 695 984

150

+

300 330 580 830 1002 300 419 669 919 1006 300 455 705 955 1132 300 458 708 958 1193 300 517 767 1017 1306

300 419 669 919 1006 300 455 705 955 1132 300 458 708 958 1193 300 517 767 1017 1306

175

+

427 677 927 1177 1265 474 724 974 1224 1402 502 752 1002 1252 1487 526 776 1026 1276 1565

300 513 763 1013 1248 487 737 987 1237 1525

200

+

502 752 1002 1252 1487 646 896 1146 1396 1685

+

613 863 1113 1363 1652

873 1123 1373 1623 1912

662 912 1162 1412 1701

Table 6. Allowable Locations for Circular, Square and Rectangular Holes (Domestic Applications) Notes for Table 6: 1.

= Circular Holes,

= Square Holes and

= Rectangular Holes

2.

Where more than one hole is to be cut, the minimum spacing between holes must be 2 times the width of the largest hole

3.

The rectangular hole width b should not exceed 1.5 x times the height D

4.

Cut all holes carefully. Do not over-cut and do not cut the flanges

5.

Where holes are required in the rim and header joists of timber frame construction refer to James Jones & Sons

6.

Plastic plumbing is ideal for use with JJI-Joists. Where copper plumbing is to be used, careful consideration of the sequence of pipe installation is required

7.

The bearing support length used for this table is 100mm

8.

Joist Span refers to engineering span

SERVICE HOLE HELP DIAGRAM

A 35mm hole (18mm for 145 deep joist) may be drilled anywhere on the centre line of the web material provided there is a minimum of 35mm (18mm) from the edge of the hole to the end of the joist and it is not directly over a support

D

D1

3mm

D2

D 3mm

2xD L See hole charts

Hole spacing 2 x larger of b or D2

Hole spacing 2 x larger of D1 or D2 Span

b L See hole charts

873 1123 1373 1623 1912


FIRE AND DURABILITY

FIRE RESISTANCE Successful fire tests have been carried out on JJI-Joists by Chiltern International Fire. A half-hour floor, a one-hour floor and a half-hour floor incorporating ceiling downlighters have all been tested. The following details show the approved floor constructions described in Chiltern International Fire Assessment Numbers FEA/F99142A Rev B and FEA/F99142B that provide a half-hour and one hour period of fire resistance respectively.

ONE-HOUR 60 MIN. FIRE RESISTANCE 1. Floor Deck

2. Structural Member

HALF-HOUR 30 MIN. FIRE RESISTANCE 1. Floor Deck

2. Structural Member 3. Ceiling

1. Floor Deck • 22mm (for 600mm centres joists) and 18mm (for less than 450mm centres joists) flooring grade chipboard • 18mm flooring grade plywood • 18mm oriented strand board (OSB) • 21mm T&G softwood flooring 3. Ceiling

2. Structural Member 1. Floor Deck • 22mm (for 600mm centres joists) and 18mm (for less than 450mm centres joists) flooring grade chipboard • 18mm flooring grade plywood • 18mm oriented strand board (OSB) • 21mm T&G softwood flooring

• JJI-Joist designed to support the applied loads at maximum 600mm centres (excluding 145mm deep) 3. Ceiling • 12.5mm + 19mm gypsum wallboard and no board edge noggings • 2 no. layers 15mm gypsum wallboard with edge noggings

2. Structural Member • JJI-Joist designed to support the applied loads at maximum 600mm centres (excluding 145mm deep) 3. Ceiling

Optional – Glass wool or rock fibre insulation (not shown) laid on back of ceiling lining Reference – Chiltern International Fire assessment No. FEA/F99142B

• 15mm gypsum wallboard without board edge noggings • 12.5mm gypsum wallboard with 5mm gypsum plaster skim with board edge noggings • 12.5mm ‘fire resisting’ plasterboard with board edge noggings • 15mm ‘fire resisting’ plasterboard and no board edge noggings Optional – Ceiling downlighters (not shown) up to 130mm diameter at minimum 500mm spacing Optional – Glass wool or rock fibre insulation (not shown) laid on back of ceiling lining Reference – Chiltern International Fire assessment No. FEA/F99142A Rev B

TREATMENT AND DURABILITY JJI-Joists are untreated and when used in a Service Class 1 or 2 environment, the ETA certificate advises that they may be taken to have a service life in excess of 50 years.

FLAME RETARDANT (FR) TREATMENT James Jones and Sons have been heavily involved in the Structural Timber Association (formerly UKTFA) on-going project to develop fire design guidance and test methods aimed at mitigating the risk of fire during construction of timber frame buildings. As part of this work we have performed fire tests with flame retardants from two manufacturers with positive results. Where there is no alternative it is possible for us to supply a non-standard FR treated joist that complies with the Structural Timber Association FR build requirements. Pricing and delivery times on application. PRESERVATIVE TREATMENT JJI-Joists are available with preservative treated timber flanges. This allows their use in Use Class 2 conditions in accordance with BS EN335-1, and Hazard Class 2 conditions in accordance with NHBC Standards, i.e. load bearing external wall studs and flat roof joists. This treatment does not affect the structural properties of the JJI-Joist. Please contact James Jones and Sons for further information.

9


10

ACOUSTIC PERFORMANCE AND SCHEDULE OF WEIGHTS

ACOUSTIC REQUIREMENTS

SCHEDULE OF WEIGHTS FOR BUILDING MATERIALS

JJI-Joists can be used in both intermediate and separating floors that comply with Building Regulation requirements for Resistance to the Passage of Sound (Part E) provided appropriate detailing is used. Alternative solutions may be required in Scotland. Please refer to the Scottish Building Regulations. Part 5: Noise.

The following schedule provides a useful reference for building material weights (kN/m2) and has been prepared from proprietary information and BS648 Weights of Materials. kN/m2

Material 18mm Chipboard

INTERMEDIATE FLOORS MINIMUM CONSTRUCTION COMPLYING WITH PART E2B 2. Structural Member

1. Floor Deck

40dB

0.13

kN/m2

Material 12.5mm Plasterboard

0.09

22mm Chipboard

0.16

15mm Plasterboard

0.11

15mm Plywood

0.10

19mm Plank

0.15

19mm Plywood

0.12

12.5mm Fireboard

0.11

15mm OSB

0.11

5mm Skim Coat

0.05

18mm OSB

0.13

100mm Glass Fibre

0.02

18mm T&G Boards

0.10

100mm Rock Wool

0.04

22mm T&G Boards

0.12

Timber Studs with 12.5mm Plasterboard

0.29

40dB

Table 7. Material Weights 3. Ceiling

1. Floor Deck – 18mm flooring grade chipboard. 2. Structural Member – 220mm deep JJI-Joists at a minimum 400mm centres 3. Ceiling – 15mm gypsum wall board and no board edge noggings

COMPARTMENT FLOOR

COMPARTMENT FLOOR

Robust detail E-FT-1

Robust detail E-FT-5

Generic solution

www.cellecta.co.uk

JJI-JOISTS IN TIMBER FRAME CONSTRUCTION COMPLYING WITH PART E1 1

2

3

JJI-JOISTS IN TIMBER FRAME CONSTRUCTION COMPLYING WITH PART E1

1

2

3

4

4

5

5

6 7

6 8

7

1. 18mm chipboard and 19mm plasterboard plank

1. Cellecta dry screed board

2. 70mm dynamic battens at 600mm centres

2. Cellecta composite resilient layer

3. Minimum 25mm quilt between battens

3. Sub-deck board, minimum 15mm

4. Sub-deck board, minimum 15mm

4. 100mm mineral fibre based quilt

5. 100mm mineral fibre based quilt

5. Resilient bars at 400mm centres

6. Resilient bar at 400mm centres

6. Minimum 245mm deep JJI-Joist at centres to suit span

7. Minimum 235mm deep JJI-Joist at centres to suit span

7. 12.5mm plasterboard and 19mm plasterboard plank or 2 no. layers of 15mm plasterboard

8. 12.5mm plasterboard and 19mm plasterboard plank or 2 no. layers 15mm plasterboard


JJ-BEAM AND JJ-RIM (GLULAM)

INTRODUCTION

JJ-BEAM AND JJ-RIM RANGE AND TOLERANCES

JJ-Beam and JJ-Rim (Glulam) are both high specification engineered timber products made by gluing together strength graded timber laminations to make up larger sections and distribute the natural defects evenly throughout the volume. The laminations are finger jointed to allow long lengths to be formed. This results in a structural unit of great strength and dimensional stability. Glulam beams can be produced in a range of sectional sizes and are available from James Jones & Sons in lengths up to 12m.

James Jones & Sons can supply JJ-Beam and JJ-Rim as part of the JJI-Joist system. Both products are available in depths that match the JJI-Joist range (Table 1) and three standard widths. See table below for standard range. Other sizes and grades are available to special order. Section Depth 195 220 235 245 300 350 400 450

JJ-Beam is the higher specification of the two products and is ideal for use as a highly loaded structural beam. JJ-Rim is a lower specification providing a economical solution for use as rim material in timber frame construction, but may also be used as a beam. TYPICAL GLULAM SECTIONS

38 ✓ ✓ ✓ ✓ ✓*

Width 45 ✓ ✓ ✓ ✓ ✓ ✓* ✓* ✓*

90 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

Table 8. JJ-Beam and JJ-Rim Product Range Note for Table 8: 1.

* Unless a separate stability check is performed, these depths should only be used as multiply members or rim beams Member Dimension

Tolerance (mm)

Width

+/– 2.0 mm

Depth

+/– 2.0 mm

Length

+/– 5.0 mm

Table 9. JJ-Beam and JJ-Rim Manufacturing Tolerances JJ-BEAM AND JJ-RIM IDENTIFICATION AND MARKING JJ-Beam and JJ-Rim are only available through our Distributors and are generally not marked on the product so that it may be left visible if desired. Care should be take to ensure that JJ-Beam and JJ-Rim used onsite has been supplied by the Distributor and not a similar but lower specification product from another source. ADVANTAGES

JJ-BEAM AND JJ-RIM PROPERTIES

Glulam beams offer many design performance advantages over conventional timber sections making them ideal for use in domestic and commercial JJI-Joist systems where high load capacity is required. JJ-Beam and JJ-Rim are:

JJ-Beam and JJ-Rim should be designed to Eurocode 5 and requires the use of characteristic values as shown in Table 10.

Strong – high specification laminates

Stiff – resulting in small deflections

Consistent – quality assured production process

Stable – good dimensional stability and consistent sizing

Reliable – elimination of the drying splits/shakes common in solid timber

• •

Characteristic Values

JJ-Rim

JJ-Beam

Units

24

32

N/mm2

ft,0,g,k

14

19.5

N/mm2

ft,90,g,k

0.35

0.45

N/mm2

Compression strength

fc,0,g,k

21

26.5

N/mm2

fc,90,g,k

2.4

3.0

N/mm2

Shear strength

fv,g,k

2.2

3.2

N/mm2

Modulus of elasticity

E0,g,mean

11600

13700

N/mm2

E0,g,05

9400

11100

N/mm2

E90,g,mean

320

420

N/mm2

Bending strength

fm,g,k

Tension strength

Long – available in 12m lengths

Shear modulus

Gg,mean

590

780

N/mm2

Straight – no twist even with large sections and longer lengths

Density

g,k

350

410

Kg/m3

These characteristics make JJ-Beam and JJ-Rim ideal for use as trimmers, beams, purlins, rim boards, columns and lintels, etc. In many instances JJ-Beam and JJ-Rim can be used to replace steel elements making installation and fixing easier.

Table 10. Characteristic Values PARTIAL FACTORS Care should be taken to ensure that all partial factors used to convert the characteristic values to design values are correctly chosen for the prevailing design conditions. For example, load duration, member depth, service class, etc.

11


12

JJ-BEAM AND JJ-RIM (GLULAM)

DURATION OF LOAD

SERVICE CLASS

0.60

Load Duration Class Medium Short term term 0.70 0.80 0.90

2

0.60

0.70

0.80

0.90

1.10

3

0.50

0.55

0.65

0.70

0.90

Service class 1

Permanent

Long term

Service class 1 2

Instantaneous

kdef 0.60 0.80

1.10

Table 12. kdef for JJ-Beam and JJ-Rim design To assist designers who are not familiar with Eurocode 5, Table 13 has been prepared by applying the appropriate factors to the characteristic values of JJ-Beam and JJ-Rim for a domestic floor application.

Table 11. kmod for JJ-Beam and JJ-Rim design MATERIAL The material modification factor can be taken as M = 1.25.

Width Depth (mm) (mm) 38 195 220 235 245 300 45 195 220 235 245 300 350 400 450 90 195 220 235 245 300 350 400 450

Area

Depth d/w Factor Kh

(mm2) (–) 7410 5.1 8360 5.8 8930 6.2 9310 6.4 11400 7.9 8775 4.3 9900 4.9 10575 5.2 11025 5.4 13500 6.7 15750 7.8 18000 8.9 20250 10.0 17550 2.2 19800 2.4 21150 2.6 22050 2.7 27000 3.3 31500 3.9 36000 4.4 40500 5.0

(–) 1.10 1.10 1.10 1.09 1.07 1.10 1.10 1.10 1.09 1.07 1.06 1.04 1.03 1.10 1.10 1.10 1.09 1.07 1.06 1.04 1.03

Section Modulus Z

Moment of Inertia I

(105mm3) (107mm4) 2.41 2.35 3.07 3.37 3.50 4.11 3.80 4.66 5.70 8.55 2.85 2.78 3.63 3.99 4.14 4.87 4.50 5.51 6.75 10.13 9.19 16.08 12.00 24.00 15.19 34.17 5.70 5.56 7.26 7.99 8.28 9.73 9.00 11.03 13.50 20.25 18.38 32.16 24.00 48.00 30.38 68.34

Weight

Flexural Rigidity EI

(kg/m) (109 Nmm2) 2.96 272 3.34 391 3.57 477 3.72 540 4.56 992 3.51 323 3.96 463 4.23 565 4.41 640 5.40 1175 6.30 1865 7.20 2784 8.10 3964 7.02 645 7.92 926 8.46 1129 8.82 1279 10.80 2349 12.60 3730 14.40 5568 16.20 7928

JJ-Rim Shear Rigidity GA (106 N) 4.37 4.93 5.27 5.49 6.73 5.18 5.84 6.24 6.50 7.97 9.29 10.62 11.95 10.35 11.68 12.48 13.01 15.93 18.59 21.24 23.90

Moment Shear Flexural Capacity Capacity Weight Rigidity Md Vd EI (kNm) (kN) (kg/m) (109 Nmm2) 2.71 3.11 3.19 322 3.45 3.51 3.59 462 3.93 3.74 3.84 563 4.26 3.90 4.00 638 6.26 4.78 4.90 1171 3.21 3.68 3.77 381 4.09 4.15 4.26 547 4.66 4.43 4.55 667 5.04 4.62 4.74 756 7.41 5.66 5.81 1387 9.93 6.60 6.77 2203 12.80 7.55 7.74 3288 16.01 8.49 8.71 4682 6.42 7.36 7.55 762 8.18 8.30 8.51 1094 9.32 8.87 9.09 1333 10.08 9.24 9.48 1511 14.82 11.32 11.61 2774 19.86 13.21 13.55 4405 25.59 15.09 15.48 6576 32.01 16.98 17.42 9363

JJ-Beam Shear Moment Rigidity Capacity GA Md (106 N) (kNm) 5.78 3.62 6.52 4.60 6.97 5.24 7.26 5.68 8.89 8.34 6.84 4.28 7.72 5.45 8.25 6.21 8.60 6.72 10.53 9.88 12.29 13.24 14.04 17.06 15.80 21.34 13.69 8.57 15.44 10.90 16.50 12.42 17.20 13.44 21.06 19.75 24.57 26.48 28.08 34.12 31.59 42.68

Shear Capacity Vd (kN) 6.74 7.61 8.13 8.47 10.38 7.99 9.01 9.63 10.04 12.29 14.34 16.38 18.43 15.97 18.02 19.25 20.07 24.58 28.67 32.77 36.86

Table 13. JJ-Beam and JJ-Rim Design Values for Domestic Flooring Applications Notes for Table 13: 1.

The moment and shear capacities are applicable for domestic floor applications only

2.

Strength modification factor k mod = 0.8

3.

Partial load factor F = 1.5

4.

Partial material factor M = 1.25

JJ-BEAM AND JJ-RIM POINT LOADS AND UDL

5.

Depth factor = (600/h)0.1

6.

Larger section properties are available upon request

UDL P

JJ-BEAM AND JJ-RIM VERTICAL LOAD CAPACITIES

Width

Permissible long term load per metre run (kN/m)

Characteristic load per metre run (kN/m)

JJ-Rim

JJ-Beam

JJ-Rim

JJ-Beam

38

38.9

48.6

91.2

114.0

45

46.1

57.6

108.0

135.0

90

92.2

115.2

216.0

270.0

Table 14. JJ-Beam and JJ-Rim Vertical Loads Notes for Table 14: 1.

Permissible loads are derived using Eurocode 5 Medium Term load duration

2.

Point loads (P) can be calculated using the following expression where Lb is the

3.

Allowance may be made for load spreading of sole plates and bottom rails

kmod =0.8 contact length of the applied load in mm. P = UDL x (Lb+60)/1000

Lb


JJ-BEAM AND JJ-RIM (GLULAM)

STORAGE ON SITE

SERVICE HOLES IN JJ-BEAM AND JJ-RIM

JJ-Beam and JJ-Rim will typically arrive on site with a moisture content between 10% and 15%, and will achieve a moisture content of approximately 12% when installed in Service Class 1 conditions.

Holes or notches should be formed in accordance with the guidelines given for solid timber members in The Building Regulations Approved Document “Timber Intermediate Floors for Dwellings”, clause 2.5. The hole and notch diagram is applicable to uniformly loaded single span beams only. For all other applications, consult the JJI-Joist Distributor.

JJ-Beam and JJ-Rim should be stored clear of the ground on a flat level surface and protected from the weather. Once installed, if the structure will not be weather tight for a prolonged period of time, the JJ-Beam and JJ-Rim should be protected from the weather to avoid excessive changes in moisture content, and associated dimensional changes.

SERVICE HOLE HELP DIAGRAM

Holes spaced apart by at least 3 times hole diameter

TREATMENT AND DURABILITY JJ-Beam and JJ-Rim is untreated. When used in a Service Class 1 or 2 environment it will have a natural durability comparable to that of solid European white wood.

D

Following discussions with the NHBC it has been confirmed that when used as a rim beam in timber frame construction and protected by a layer of sheathing and breather paper, no additional preservative treatment is required.

Holes and notches to be cut in shaded areas only. Hole diameter must not exceed 60mm. Notch depth not to exceed 30mm.

100mm minimum between holes and notches 0.25 x span 0.07 x span

0.4 x span

Prior to preservative treatment advice should be sought from the manufacturer.

Maximum hole diameter D/4

Maximum notch depth D/8

0.25 x span

FIRE RESISTANCE AND TREATMENT For the purpose of calculating the fire resistance of JJ-Beam and JJ-Rim members, a charring rate of 0.66mm per minute should be used.

In addition to the rules given above a 35mm circular hole can be drilled at any location along the centre line of a JJ-Beam and JJ-Rim members provided the following rules are observed: •

The hole must be a minimum of one member depth away from the end of the joist

The hole must be a minimum of one member depth away from the nearest support

No two adjacent holes should be located any closer together than 70mm edge to edge

For holes larger than 35mm contact your Distributor for advice

13


14

JJ-BEAM AND JJ-RIM FIXING DETAILS

FIXING OF MULTIPLY JJ-BEAM AND JJ-RIM MEMBERS Multiply JJ-Beam and JJ-Rim members can be fixed together using nails, screws or bolts depending on availability and preference. Screws – Where possible, James Jones & Sons recommend the use of large diameter self tapping screws in preference to nails or bolts. The following products can be supplied by the approved JJI-Joist metalwork suppliers. •

Cullen Building Products LedgerLok @ Ø5.8mm

Simpson Strong-Tie SDW screw @ Ø5.6mm

For details of the available screw sizes and advice on how they should be used please refer to the relevant metalwork manufacturer’s technical literature (see page 17 for contact details). Section Makeup Ply Thickness (mm) Overall width (mm) 2 rows of 3.1x75mm nails (300 centres) 3 rows of 3.1x75mm nails (300 centres) 2 rows of M12 bolts (600 centres) 2 rows of M12 bolts (400 centres) 2 rows of M12 bolts (300 centres)

Fixing Detail

A B C D E

38 76 4.51 6.77 15.20 22.79 30.39

2 ply 45 90 4.55 6.83 16.10 24.15 32.20

For cases where large diameter self-tapping screws are not available this section provides some standard nailing and bolting details for uniformly loaded multiply members loaded from one face only (e.g. incoming joists on hangers at 600mm centres or less). Nails – For two ply 38mm and 45mm members nails are the cheapest and most easily made fixing. Nails can also be used in three ply 38mm and 45mm members although designers are encouraged to use a screwed connection solution where possible. Bolts – Bolts can be used to connect together up to 5 ply 45mm members.

3 ply 90 180 21.68 32.52 43.36

38 114 3.38 5.08 11.40 17.10 22.79

4 ply 45 135 3.42 5.12 12.07 18.11 24.15

38 152 10.13 15.20 20.26

5 ply 45 180 10.73 16.10 21.46

45 225 10.06 15.09 20.12

38 190 9.50 14.25 18.99

Table 15a. Maximum Permissible Uniform Line Load (kN/m) for Multiply JJ-Rim Members Loaded from One Face Section Makeup Ply Thickness (mm) Overall width (mm) 2 rows of 3.1x75mm nails (300 centres) 3 rows of 3.1x75mm nails (300 centres) 2 rows of M12 bolts (600 centres) 2 rows of M12 bolts (400 centres) 2 rows of M12 bolts (300 centres)

Fixing Detail

F G H I J

38 76 5.00 7.49 16.86 25.29 33.71

2 ply 45 90 5.05 7.57 18.01 27.01 36.02

3 ply 90 180 23.47 35.19 46.93

38 114 3.75 5.62 12.65 18.97 25.29

4 ply 45 135 3.78 5.67 13.51 20.26 27.02

38 152 11.24 16.86 22.48

5 ply 45 180 12.01 18.01 24.01

38 190 10.54 15.81 21.07

45 225 11.26 16.88 22.51

Table 15b. Maximum Permissible Uniform Line Load (kN/m) for Multiply JJ-Beam Members Loaded from One Face Notes for Table 15a and b: 1.

The values in the tables above are applicable to members loaded to one face only

2.

Nail diameters indicated are based on common sizes of power driven nails, hammer driven nails up to 4.5mm may be used

3.

38mm diameter x 3mm thick washers are required under each head and nut on M12 bolts. Bolts to be minimum 4.6 grade

4.

Sections over 180mm wide should be loaded equally from both sides unless checked by an Engineer

5.

Bolt length to be no less than the overall width of beam + 18mm, e.g. a 90mm JJ-Beam and JJ-Rim would require a 108mm bolt

6.

Fixing details can be advised by Distributor or noted on layout drawing

Nails in two ply members should be fixed in two rows 45mm in from the top and bottom edge and one row along the centre line if required, driven from alternate sides. The minimum end distance “e” should be 90mm. NAILING PATTERN FOR 2 PLY JJ-BEAM AND JJ-RIM MEMBERS A

45

45 e

c/c

c/c =Fixings from front face

c/c =Fixings from rear face

A

Section A-A


JJ-BEAM AND JJ-RIM FIXING DETAILS

Nails in three ply members should be fixed in two rows 45mm in from the top and bottom edge and one row along the centre line if required, driven through each outer ply into the central one.

Note that nails from any one face should be at the specified centres with the nails from the opposite face offset by half the centres distance. The minimum distance “e” from the last column of nails to the end of the member should be 90mm.

NAILING PATTERN FOR 3 PLY JJ-BEAM AND JJ-RIM MEMBERS half c/c

c/c

c/c

B

c/c

45

45 c/c

e

c/c

c/c

=Fixings from front face

Bolts should be fixed in two rows 65mm in from the top and bottom edge.

B

Section B-B

=Fixings from rear face

Bolt holes should be drilled at Ø12mm and bolts tapped into place. The minimum end distance “e” should be 48mm.

BOLTING PATTERN FOR UP TO 5 PLY JJ-BEAM AND JJ-RIM MEMBERS C

65

65 c/c

e

C

c/c

Section C-C

POINT LOADS Multiply JJ-Beam and JJ-Rim members are often used as trimming joists parallel with the short edge of stair wells resulting in significant point loads from the trimmer. In situations like this where an isolated point load is to be carried by a multiply member, the designer needs to consider a localised fixing close to the incoming member.

Tables 16 a and b give maximum long term point loads that can be carried if the following fixing details are used.

NAILING PATTERN FOR A 2 PLY JJ-BEAM AND JJ-RIM MEMBER WITH AN INCOMING POINT LOAD 45 =

= 45 90

90

90

=Fixings from front face

90

15


16

JJ-BEAM AND JJ-RIM FIXING DETAILS

NAILING PATTERN FOR A 3 PLY JJ-BEAM AND JJ-RIM MEMBER WITH AN INCOMING POINT LOAD 45 =

= 45 90

90

90

90

=Fixings from front face

90

90

=Fixings from rear face

BOLTING PATTERN FOR JJ-BEAM AND JJ-RIM MEMBER (UP TO 4 PLY) WITH AN INCOMING POINT LOAD

65

65 90

Section Makeup Ply Thickness (mm) Overall width (mm) Nail Detail Bolt Detail

Fixing Detail

K L

38 76 8.12 18.23

90

2 ply 45 90 7.68 19.31

3 ply 90 180 26.02

38 114 6.09 13.67

4 ply 45 135 5.76 14.49

45 180 12.88

38 152 12.15

Table 16a. Maximum Permissible Isolated Point Load (kN) for Multiply JJ-Rim Members Loaded from One Face

Section Makeup Ply Thickness (mm) Overall width (mm) Nail Detail Bolt Detail

Fixing Detail

M N

38 76 8.99 20.23

2 ply 45 90 9.08 21.61

3 ply 90 180 28.16

38 114 6.74 15.18

4 ply 45 135 6.81 16.21

38 152 13.49

45 180 14.41

Table 16b. Maximum Permissible Isolated Point Load (kN) for Multiply JJ-Beam Member Loaded from One Face Notes for Table 16a and b: 1.

The values in the tables above are applicable to members loaded to one face only

2.

Capacities for nail details are based on 3.1mm diameter power driven nails (75mm long for 38mm thick plies and 90mm long for 45mm plies), hammer driven nails up to 4.5mm diameter may be used

3.

38mm diameter x 3mm thick washers are required under each head and nut on M12 bolts. Bolts to be minimum 4.6 grade

4.

Bolt length to be no less than the overall width of beam + 18mm, e.g. a 90mm JJ-Beam and JJ-Rim would require a 108mm bolt

5.

Fixing details can be advised by Distributor or noted on layout drawing


METALWORK

JJI-JOIST CONNECTION HARDWARE James Jones & Sons continues to work closely with the UK’s leading timber engineering hardware manufacturers, developing ranges of fixings to suit JJI-Joists and JJ-Beam. The products include a complete range of fixings for timber to timber, timber to masonry and timber to steel connections. Only hardware approved by James Jones & Sons should be used with

JJI-Joists and JJ-Beam to ensure quality construction standards. In addition, all approved hardware is automatically specified by James Jones & Sons JoistMaster and FloorMaster software. All connection hardware/fixings are available from JJI-Joist Distributors as part of the JJI-Joist system.

www.itw-industry.com +44 (0)1592 771132

www.strongtie.co.uk +44 (0)1827 255600

The UH Hanger – for any joist to joist or joist to trimmer application

The ITSE Hanger – top fix hanger for supporting I-Joists from timber member

The UH Hanger

The ITSE Hanger The Safety Fast Hanger – a masonry hanger that can support load without the need for propping or masonry above to hold the hanger in place

The RA Hanger – the easy to use safety solution for timber to masonry connections which is built off the same course of blockwork as built-in joists

RA Hanger

Safety Fast Hanger The JES Joist End Support – a two piece metal work system which enables the use of engineered timber I-Joists in loft conversions

The Gripper – the easy solution for Building Regulation compliance at JJI-Joist ends when building into masonry walls

JES Joist End Support

Gripper The I-Clip – an alternative solution to traditional filler blocks for simple integrity inspection and a quicker on-site construction

I-Clip

The MJC Connector – allows two I-Joists or two metal web joists to be fixed together to act like a single unit

MJC Connector The IHS I-Joist Hole Support – designed to strengthen I-Joists when holes are required to be cut in locations not normally permitted

The SHI Plate – allows large service pipes, ducting and cables to run through an aperture cut through the web of the I-Joist

SHI Plate

IHS I-Joist Hole Support

General Notes •

For details of newly approved manufacturers contact James Jones & Sons

Refer to approved manufacturers literature for details of hanger ranges, safe working loads, nailing requirements and installation instructions

Web stiffeners are not required when approved hangers are used unless the JJI-Joist design states otherwise

DO NOT USE NON-APPROVED HANGERS – IF IN DOUBT, ASK

17


18

FLOOR DESIGN

FACTORS AFFECTING FLOOR PERFORMANCE The following list describes factors that affect floor performance and consideration of these factors may be helpful when designing and installing a JJI-Joist floor system:

F38

TYPICAL TIMBER FRAME GROUND FLOOR DETAIL

DPC

Joist Depth Deeper joists create a stiffer floor thereby reducing deflection. A deep floor joist solution may in fact be cheaper than a shallow joist solution as you may be able to use thinner joists at wider centres.

Min 150mm Min 150mm UPVOEFSTJEF PGKPJTU

Deck Fixing A correctly nailed floor deck will improve floor performance by about 12%*. Gluing the floor deck to the joists, and gluing tongued and grooved joints is required by NHBC Standards Section 6.4 S1.9 and S2.0, and is also recommended in BS 7916. In addition, the floor performance can improve by as much as 70% when the floor deck is glued to the joists*.

External Timber Frame Wall

Min 75 UP%1$

DPC

Sleeper Wall

t*OUFSOBMHSPVOEDPWFSJOHUPDPNQMZXJUI#VJMEJOH3FHVMBUJPOT t*OTVMBUJPOJOøPPSWPJEPNJUUFEGPSDMBSJUZ

Deck Thickness Thicker floor deck material will improve the floor performance.

F44

TYPICAL MASONRY GROUND FLOOR DETAIL

Ceiling Treatments Directly applied ceiling finishes will improve floor performance by about 3%*. Blocking

DPC

Full depth blocking will improve floor performance. Workmanship Good quality workmanship is essential to achieve good floor performance. The provision of well prepared and level bearings, methodical erection procedure, diligent installation of all fixings and in particular fixing of the floor deck (including gluing where required) will have a significant effect on floor performance. The maximum acceptable tolerance on the level of bearings is +/- 3mm. *

Figures obtained from independent laboratory tests originating from a government (DETR) research project.

SPECIAL CONSIDERATION FOR GROUND FLOOR DESIGN Timber in ground floor construction is in a more moist environment than timber in an upper floor. As such, JJI-Joists for use in ground floors should be designed using joist properties for Service Class 2 conditions. Insulation Thermal insulation is required in all ground floors and each different building type should be assessed individually to identify the specific U-value requirements and thus the corresponding thickness of insulation to be used. Three options for providing ground floor insulation are as follows: 1. Quilt insulation supported on plastic netting or breather membrane 2. Quilt insulation supported on a board fixed to the top side of the bottom flange of the JJI-Joist 3. Solid insulation supported on bottom flange of the JJI-Joist

Min 75 to DPC

DPC

Min 150mm UPVOEFSTJEF PGKPJTU

Sleeper Wall

Min 150mm

External Masonry Wall

t*OUFSOBMHSPVOEDPWFSJOHUPDPNQMZXJUI#VJMEJOH3FHVMBUJPOT t*OTVMBUJPOJOøPPSWPJEPNJUUFEGPSDMBSJUZ

Most heat loss through a ground floor occurs around the floor perimeter and so the inclusion of insulation at the edges helps maintain overall insulation levels. Resistance to Moisture All suspended ground floors should be constructed to resist the ingress of moisture. Where external ground level is above the ground cover level, then the ground cover should be laid to fall to a suitable drainage outlet. Ventilation All parts of the void underneath the suspended floor require a ventilation path to the outside. The ventilation openings should be at least 1500mm2 for each metre run of two opposite sides of the floor, or alternatively in Scotland, an opening area 500mm2 for every 1m2 of floor area may be provided. Radon Gas The construction of suspended timber ground floors in areas affected by Radon gas requires specialist advice. Access for the Disabled For guidance on providing access thresholds consult James Jones & Sons or the Stationery Office booklet Accessible thresholds in new housing (ISBN 011 702 333 7).


DOMESTIC INTERMEDIATE AND APARTMENT FLOOR SPAN TABLES

DOMESTIC FLOOR SPAN TABLES The domestic intermediate floor span tables below are based on the following design criteria: •

Dead Load including partition allowance is 1.15kN/m2 for flats or 0.75kN/m2 for houses

Imposed Load 1.5kN/m2 (Domestic floor imposed load).

Deflection limit 0.003 x span or 12mm (NHBC requirement) whichever is lesser

The spans given are for simply supported and uniformly loaded joists only

Where the load conditions are different to those described, refer to the JJI-Joist supplier for further assistance

Joist Type JJI 145 A+ JJI 195 A+ JJI 195 B+ JJI 195 C JJI 195 D JJI 220 A+ JJI 220 B+ JJI 220 C JJI 220 D JJI 235 A+ JJI 235 B+ JJI 235 C JJI 235 D JJI 245 A+ JJI 245 B+ JJI 245 C JJI 245 D JJI 300 A+ JJI 300 B+ JJI 300 C JJI 300 D *JJI 350 A+ *JJI 350 B+ JJI 350 C JJI 350 D *JJI 400 A+ *JJI 400 B+ JJI 400 C JJI 400 D *JJI 450 A+ *JJI 450 B+ *JJI 450 C JJI 450 D

300 3197 4155 4478 4656 5064 4473 4863 5002 5398 4645 5044 5192 5604 4756 5155 5315 5742 5338 5741 5956 6461 5777 6172 6528 7032 6248 6672 7108 7516 6690 7140 7354 7911

Apartments Dead load up to 1.15kN/m2 Joist Centres (mm) 400 480 2860 2660 3782 3527 4135 3902 4297 4081 4664 4424 4136 3909 4491 4268 4617 4386 4975 4721 4296 4086 4659 4428 4794 4554 5166 4903 4399 4184 4762 4526 4907 4662 5293 5024 4938 4698 5306 5044 5501 5228 5959 5657 5346 5087 5707 5427 6030 5731 6487 6160 5781 5502 6168 5866 6565 6239 6935 6587 6191 5891 6601 6278 6797 6462 7303 6937

600 2428 3232 3570 3760 4143 3586 4006 4115 4423 3782 4158 4274 4595 3908 4250 4376 4709 4418 4739 4909 5304 4784 5100 5382 5777 5175 5513 5859 6179 5541 5901 6071 6510

300 3402 4343 4684 4872 5303 4675 5086 5232 5651 4855 5275 5431 5866 4970 5390 5559 6010 5577 6002 6229 6761 6036 6452 6827 7359 6527 6973 7433 7863 6989 7462 7688 8275

The joists are designed using the principles of BS 5268-2

Adequate lateral restraint to the top flange of the joists is assumed to be provided by the floor deck. 18mm chipboard or equivalent for joists up to 400mm centres and 22mm chipboard or equivalent for joists at up to 600mm centres

JJI-Joist calculation sheets display a Serviceability Index (SI) which is a measure of the joist performance, maximum allowable deflection/ actual deflection. The minimum permissible SI value is 1.0. The spans given in the tables below have a SI of 1.0 for a 0.003 x span or 12mm deflection limit. The spans do not include any of the beneficial effects of the various factors which may affect the floor performance as detailed on page 18.

Houses Dead load up to 0.75kN/m2 Joist Centres (mm) 400 480 3048 2839 4017 3755 4328 4114 4498 4274 4888 4639 4325 4115 4700 4468 4833 4593 5212 4948 4492 4274 4875 4635 5017 4769 5412 5139 4599 4376 4982 4737 5136 4881 5545 5265 5162 4913 5550 5279 5756 5473 6240 5927 5587 5319 5968 5677 6310 5999 6793 6453 6043 5752 6450 6137 6869 6531 7261 6899 6471 6159 6903 6568 7109 6762 7644 7264

600 2596 3447 3811 4012 4348 3821 4197 4312 4640 4020 4354 4478 4819 4116 4451 4584 4938 4622 4961 5142 5561 5005 5338 5636 6056 5413 5770 6136 6476 5796 6176 6356 6821

300 63 69 81 86 107 77 91 105 118 79 95 112 123 82 97 113 126 90 101 117 129 98 110 120 130 102 114 124 131 109 119 125 132

Most Economical Solution (1-132) Joist Centres (mm) 400 480 27 10 30 12 44 21 48 25 73 49 40 17 54 29 72 47 92 67 42 18 56 33 78 7 100 76 45 23 59 35 83 60 108 88 51 28 64 41 89 65 115 99 61 36 75 52 94 70 122 111 66 43 84 62 103 80 127 116 74 50 93 68 106 87 128 121

600 1 2 5 7 20 3 9 19 37 4 11 26 46 6 13 31 58 8 15 34 71 14 24 39 85 16 32 53 96 22 38 57 104

Table 17. Maximum Engineering Span for Domestic Intermediate Floors Notes for Table 17: 1.

These tables serve as guidance only. For a more detailed JJI-Joist appraisal contact a JJI-Joist Distributor

2.

To achieve the stated spans, adequate JJI-Joist bearing will be required. Web stiffeners may be necessary

3.

The effect of the dead weight of non-load bearing partitions in apartments can be assumed to be included

CORRECT

in the design where self-weight of the partition does not exceed 0.8kN/m run and the self-weight of the floor construction does not exceed 0.9kN/m2 4.

The effect of the dead weight of non-load bearing partitions in houses can be assumed to be included in the design where self-weight of the partition does not exceed 0.8kN/m run and the self-weight of the floor construction does not exceed 0.5kN/m2

Engineering Span

5.

Permissible web holes to be drilled in accordance with JoistMaster software or hole chart Table 6 on page 8

6.

For all solutions that work for a particular span the one with the lowest 'Most Economical Solution' index will

7.

* The top and bottom flanges of these sizes require continuous lateral restraint at a maximum of 300mm centres unless a lateral buckling check has been performed

be the most cost effective

19


20

HEALTH AND SAFETY – TEMPORARY BRACING

INSTALLATION GUIDELINES This diagram indicates temporary erection bracing only. It is applicable to both timber frame and masonry construction. 1.5 m

ma x

Nail all binders and braces to each joist with 2 no. 3.35x65mm nails Construction materials shall only be stored in the 1.5m edge zone at one end of the joist only

Min 675mm cured masonry above hanger level or as advised by hanger manufacturer 22x97mm diagonal brace Decking can be laid in lieu of diagonal bracing

2.4 m

ma x Do not store construction material close to trimmers

2.4 m 22x97mm continuous longitudinal binders must be connected to a diagonally braced and blocked system at one end of the joist run

ma x 38x125mm solid timber stability blocks or I-Joist blocking panels

STABILITY BLOCKING NOTES •

Use timber blocks or JJI-Joist blocking pieces

Timber blocks to be minimum 38x125mm cut squarely and accurately to maintain joist spacing. Fasten with minimum 2 no. 3.35x65mm nails

Stability blocks need to be fixed to 3 joists and cover a minimum distance of 1200mm

Timber blocks in the diagonally braced systems are required in each run of joists and at cantilever supports

When joists butt on an interior support, block both sets of joists

Additional braced and blocked systems should be provided at 12m spacing in long joist runs

TEMPORARY ERECTION BRACING NOTES The builder is responsible for identifying and minimising the risks involved in erecting JJI-Joists to ensure that the health and safety of all workers is maintained. Builders should be aware of the health and safety responsibilities imposed on them by the Construction (Design and Management) Regulations 2007. Proper erection procedures and bracing are vital to the safe construction of JJI-Joists floors. The following notes may assist builders in preparing a safety assessment.

6. Lateral strength should be provided by a diagonally braced and blocked system across at least 3 joists as shown in the Erection Bracing Details (diagram above). Additional braced and blocking systems should be provided at 12m spacing in long joist runs 7. Once a JJI-Joist floor has been fully braced, construction materials may be placed on the floor provided that the overall weight of material to be placed on a single joist does not exceed 250kg (200kg for 195mm deep joists). To ensure that the weight is distributed in a safe manner we recommend that timber bearers (perpendicular to joist run) or a standard pallet (1200x1200) are placed under the construction materials. Bearers must extend over at least 2 joists. Please refer to Technical Bulletin 47. 8. Flooring should be fully fixed to the JJI-Joists before additional loads are placed on the floor 9. The ends of cantilevers should be stabilised with longitudinal binders fixed to the top and bottom flanges 10. Temporary bracing may be progressively removed as decking is fixed

1. Do not allow workers to walk on unbraced joists 2. Do not store building materials on unbraced joists 3. JJI-Joists should be erected straight and vertical. The maximum deviation from horizontal should not exceed 10mm and the maximum deviation from the vertical should not exceed 2mm 4. JJI-Joists are unstable until fully braced. Bracing includes: longitudinal binders, diagonal bracing, stability blocking, rim joist/rim boards 5. All longitudinal binders, diagonal braces, stability blocks, and hangers should be completely installed and fully nailed as detailed

REMOVE SAFETY BRACING AS DECKING PROCEEDS


SITE STORAGE AND RESTRICTIONS

JJI-JOIST SITE STORAGE

Protect joists from the elements. Keep them dry.

Use suitable lifting equipment to offload joist bundles. Store joists on edge.

Use supports at about 3.0m spacing to keep joists clean, level and above the ground.

TIMBER SYSTEM

S DIVISIO N

Transport joists on edge, not flat.

DO NOT lift joists by top flange.

DO NOT store joists flat.

DO NOT lift joists on the flat.

ATTENTION! THE FOLLOWING CONDITIONS ARE NOT ALLOWED DO NOT HAMMER ON THE WEB OR FLANGE

DO NOT BEVEL CUT THE JOISTS PAST THE INSIDE FACE OF THE WALL

DO NOT SUPPORT THE JOIST ON THE WEB

DO NOT WALK ON JOISTS UNTIL PROPER BRACING IS IN PLACE

DO NOT STACK BUILDING MATERIALS ON UNBRACED JOISTS DO NOT CUT HOLES TOO CLOSE TO EACH OTHER – SEE HOLE INSTALLATION GUIDE

DO NOT SPLIT THE FLANGE, ENSURE PROPER TOE NAILING

DO NOT OVER-CUT WEB HOLES

DO NOT CUT OR NOTCH FLANGES

DO NOT USE NON-APPROVED HANGERS

21


22

INDICATIVE FLOOR DETAILING – F DETAILS

EXAMPLE JJI-JOIST FLOOR SYSTEM F2

See notes and details for temporary erection bracing and procedure

F10

Where cantilever situations exist refer to specific details provided by the JJI-Joist Distributor

F23

F7 F5

F13 F9 F15

JJ-Beam

F1

F4 F12 F11 For any construction situation not addressed by the following floor details, please contact the JJI-Joist Distributor

Masonry

F3

Timber frame F14

Refer to Table 6 for hole installation chart

F1

General

CONTINUOUS JOIST ON WALL CPOUJOVPVTjoJTU

MJOJNVN89NN CFBSJOglFOHUh

AOZUZpFofloBE CFBSJOgTVQpPSU

Timber Frame

SPLIT JOIST ON WALL 3mmgapattop ofspliceblock

18x200mmplywood spliceblockoneside only,fixwithOP 335x 65mmnailT clenchedover

Eitherblockwork or++*-+oistblocking JTrequired

Anytypeofload bearingsupport Minimumjoist bearing45mm

t 8herespliUjoist(s)ofdifferentwidthsmeeUonthewalladouble rowofblockingisrequiredUosuitjoisUwidths

t 8FCTUJòFOFSTNBZCFSFRVJSFE TFF'

Masonry

F2

General


INDICATIVE FLOOR DETAILING โ€“ F DETAILS

F3

WALL AT 90หš TO JOISTS

F4 8BMMTPMFQMBUF OBJMFEUPFBDIKPJTU

1BSUJUJPOXBMM

NON-LOAD BEARING WALL PARALLEL TO JOISTS

8BMMTPMFQMBUF OBJMFEUPFBDI OPHHJOHEXBOH

/POMPBECFBSJOH XBMMNBYJNVNTFMG XFJHIUL/N

'MPPSEFDLJOH

/PHHJOHEXBOH

t 5IF'MPPS%FTJHOFSJTSFTQPOTJCMFGPSFOTVSJOHUIFKPJTUEFTJHO JTBEFRVBUFUPTVQQPSUUIFXBMM

F5

INTERMEDIATE BEARING WITH LOAD BEARING WALL ABOVE

t YNNOPHHJOHEXBOHPS++*$รธBOHFBUNBYJNVNDD BUUBDIFEXJUIOPYNNOBJMTTLFXOBJMFEBUFBDIFOE  BMUFSOBUJWFMZVTFBQQSPWFEDMJQT t 5IF'MPPS%FTJHOFSJTSFTQPOTJCMFGPSFOTVSJOHUIFKPJTUEFTJHO JTBEFRVBUFUPTVQQPSUUIFXBMM

F6 ++*+PJTUPS ++#FBN CMPDLJOH

F7

JOIST BEARING IN BLOCK WALL

Either blockwork or JJI-Joist blocking is required

Minimum bearing 45mm

-PBECFBSJOH XBMMBMJHOFE VOEFSXBMMBCPWF t 3FGFSUP'EFUBJMOPUFToUJNCFSGSBNF TFFQBHF

t 3FGFSUPQBHFGPSQFSNJTTJCMFWFSUJDBMMPBEDBQBDJUJFT

TERMINATING JOIST ON WALL

Any type of load bearing support โ€ข Suitable detailing required if used on an external wall

F8

MASONRY WALL RESTRAINT JOIST PARALLEL DETAIL 1

/PHHJOHEXBOH NJO 38x45NN TFDVSFMZรถYFE XJUIx65NNTLFX OBJMJOHPSBQQSPWFEDMJQ

Refer to approved connector manufacturerโ€™s guidelines for installation Min 0.5d instructions

Block Wall

Nogging/dwang (can be vertically aligned full depth JJI-blocking) securely fixed with 3.35x65mm skew nailing or approved clip

.JOJNVNCFBSJOH 90mm

t $POTUSVDUCMPDLXPSLBSPVOEKPJTUBOEรถMMBMMWPJETXJUIXFCรถMMFST  NPSUBSBOEQPJOUXJUINBTUJDTFBMBOU t "MUFSOBUJWFQSPQSJFUBSZTZTUFNTNBZCFVTFEJGBQQSPWFECZ++4 t 3FTUSBJOUTUSBQTXJMMCFSFRVJSFEGPSHSFBUFSUIBOTUPSFZT  4USBQTSFRVJSFEPOBMMรธPPST

Galvanised restraint strap at maximum 2.0m centres, over a minimum of 3 joists

d

Blocking between JJI-Joist and wall

RESTRAINT STRAPS ARE THE RESPONSIBILITY OF THE BUILDING DESIGNER

23


24

INDICATIVE FLOOR DETAILING โ€“ F DETAILS

F9

MASONRY WALL RESTRAINT JOIST PARALLEL DETAIL 2 Block wall

F10

Do not notch the joist flange under any circumstances

WALL RESTRAINT, BLOCK WALL HANGER SUPPORT

External masonry wall requires restraint 675mm of cured masonry before hanger loaded, see approved connector manufacturerโ€™s H&S guidelines

Strap through slot in web at level to suit block course

Nogging/dwang (min 38x45mm or JJI-blocking) securely fixed with 3.35x65mm skew nailing or approved clip

Min 0.5d 5x30mm galvanised restraint strap at maximum 2.0m centres, over a minimum of 3 joists

d Blocking between JJI-Joist and wall

Twisted offset restraint strap fixed to side of joist and built into masonry bed joint at appropriate centers

Web fillers may be required. Refer to joist design and/or approved connector manufacturerโ€™s guidelines

RESTRAINT STRAPS ARE THE RESPONSIBILITY OF THE BUILDING DESIGNER

F11

JOIST BEARING ON EXTERNAL WALL

F12

JOIST BEARING ON EXTERNAL WALL JJI Rim joist in place of JJ-Beam rim joist

"EEJUJPOBMCMPDLJOHNBZ CFSFRVJSFE UP&OHJOFFST TQFDJรถDBUJPO UPJNQSPWF t 4PVOE t 4USVDUVSBM1FSGPSNBODF t 'JYJOH t 3FGFSUP'EFUBJMOPUFToUJNCFSGSBNF TFFQBHF

t 3FGFSUPQBHFGPSQFSNJTTJCMFWFSUJDBMMPBEDBQBDJUJFT

F13

JOIST PARALLEL TO EXTERNAL WALL ++*3JNKPJTUJOQMBDF PG++#FBNSJNKPJTU

t 0OMZBQQMJDBCMFXIFSFBNBYJNVNPGPOFTUPSFZJTCVJMUBCPWF t 3FGFSUP'EFUBJMOPUFToUJNCFSGSBNF TFFQBHF

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Masonry

Timber Frame

General

โ€ข Only applicable where a maximum of one storey is built above โ€ข Refer to F detail notes โ€“ timber frame (see page 28) โ€ข Refer to page 7 for permissible vertical load capacities

F14

SINGLE JOIST TO JOIST

Ensure minimum 4 no. nails fixed through hanger into incoming joist

Backer block fixed to BOTH SIDES of principal joist. Refer to detail F21

Approved face or top fix hanger secured through specified nail holes (refer to approved connector manufacturers guidelines)


INDICATIVE FLOOR DETAILING โ€“ F DETAILS

F15

F16

SINGLE JOIST TO MULTIPLE JOIST

Ensure minimum 4 no. nails fixed through hanger into incoming joist

SINGLE JOIST TO JOIST (LIGHT LOAD)

Backer block fixed to loaded side of principal joist. Refer to detail F21

Approved metalwork secured through all nail holes (refer to connector manufacturers guidelines)

Filler block fixed as detail F19

Approved face or top fix hanger secured through specified nail holes (refer to approved connector manufacturerโ€™s guidelines)

F17

MULTIPLE JOIST TO MULTIPLE JOIST

F18

Filler block fixed as detail F19

JOIST TO ENGINEERED TIMBER

Ensure minimum 4 no. nails fixed through hanger into incoming joist

JJ-Beam or Engineered Timber

Ensure minimum 4 no. nails fixed through hanger into incoming joist

Backer block fixed to loaded side of principal joist. Refer to detail F21

Approved face or top fix hanger secured through specified nail holes (refer to approved connector manufacturers guidelines)

F19

FILLER BLOCK โ€“ DOUBLE OR TREBLE JOIST

Approved face or top fix hanger secured through specified nail holes (refer to approved connector manufacturerโ€™s guidelines)

F20

FILLER AND BACKER BLOCK TABLE

&YBNQMF JJI-Joist Depth

/BJM DMFODIFE PWFS 4UFQ %PVCMF

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4UFQ 5SFCMF

5SFCMFA%/PU"MMPXFE

t 1SPWJEFรถMMFSCMPDLTBUBMMFOETBOECFBSJOHTPGKPJTUBOEBUQPJOUT PGJODPNJOHMPBET TFF' 1SPWJEFDPOUJOVPVTรถMMFSCMPDLXIFO SFQFBUFEMPBETBSFBQQMJFE TFF'

Filler and Backer Block Depth

(mm)

(mm)

195 220 235 245 300 350 400 450

100 125 145 150 200 125+125 150+150 200+150

JJI-Joist Flange Type

A+ B+ C D

Backer Block / Web Stiffener Thickness

Filler Block Thickness

(mm)

(mm)

19 27 32 44

38 54 63 2x44

โ€ข Refer to details provided by the JJI-Joist supplier for required locations of filler and backer blocks โ€ข Where a continuous filler block is used see detail F40

โ€ข Filler and backer blocks should be kiln dried timber, structural grade plywood or OSB/3

25


26

INDICATIVE FLOOR DETAILING – F DETAILS

F21

FILLER AND BACKER BLOCK NAILING DETAIL

F22

WEB STIFFENER

For D flange size only 40

For A,B and C flange size 40 25

25

25

25

Web stiffeners are required where indicated on drawings provided by the JJI-Joist supplier • • • •

60

60 L=300mm to 600mm

19 thick for JJI A+ 27 thick for JJI B+ 31 thick for JJI C 44 thick for JJI D

– 65mm nails – 65mm nails – 65mm nails – 90mm nails

3mm gap (min)

L=350mm to 600mm Nail lengths (mm)

All filler blocks and backer blocks for face fix hangers to be fixed tight to bottom flange with a minimum 3mm gap at the top Backer blocks for top fix hangers to be fixed tight to the top flange with a minimum 3mm gap at the bottom

F23

Flange Spec

Backer Block

Filler Block

A+ B+ C D

65 65 90 90

65 90 90 90

Minimum nail diameter 3.1mm

COMPRESSION BLOCK

Fixed with 6 no. 3.35mm diameter nails length as noted above • 100mm wide plywood, OSB/3 or kiln dried timber stiffener block fitted to both sides

F24 'JYCMPDLTUP KPJTUXJUIPOFOBJM  FBDIJOUPUPQBOE CPUUPNøBOHFT

.JOJNVNOP YNNDPNQSFTTJPO CMPDLTDVUNNUBMMFS UIBO++*+PJTU

CANTILEVER

"MUFSOBUJWFMZ VTF++#FBN CMPDLJOHQJFDFT

t $PNQSFTTJPOCMPDLTBSFSFRVJSFEXIFSFJOEJDBUFEPOEFUBJMT QSPWJEFECZ++*+PJTUTVQQMJFS

F25

STAIR STRINGER CONNECTION

'VMMEFQUI ++*CMPDLJOH QJFDFTSFRVJSFE CFUXFFOKPJTUT

$BOUJMFWFS DMPTFS SFRVJSFE

"OZUZQFPGMPBE CFBSJOHTVQQPSU t #BDLTQBOPGDBOUJMFWFSNVTUCFBUMFBTUUJNFT UIFDBOUJMFWFSMFOHUI t NNBYJNVNDBOUJMFWFSMFOHUI

F26

JJI SUPPORTED ON STEEL/CORBEL WALL JJI blocking required for lateral stability

Stair trimmer (possibly 1 ply or Engineered Timber) Backer block fixed as detail F21

Timber wall plate Stringer fixed to trimmer as Building Designer’s detail

Masonry

Filler block fixed as detail F19

Timber Frame

General

Steel angle bracket or masonry corbel


INDICATIVE FLOOR DETAILING – F DETAILS

F27

LOAD BEARING WALL PARALLEL TO JOIST RUN

Load bearing or shear wall parallel to joist span

Add JJI-Joist or JJ-Beam parallel with joist run under load bearing wall

F28

NEWEL POST TO TRIMMER

Backer block fixed to loaded side of principal joist. Refer to detail F21 Filler block fixed as detail F19

Fix sole plate of wall to joist at centres specified by Building Designer • Ensure that the added joist size is adequate to support the load of the bearing wall. A double joist may be required by the Building Designer

F29

JOIST TO STEEL BEAM FACE FIXING Continuous timber blocking fixed to Building Designer’s detail

Beam Top Level

Cut and recess newel to fit over trimmer in accordance with BS 585-1

F30

JOIST TO STEEL BEAM/MASONRY

675mm of cured masonry before hanger loaded, see approved connector manufacturer’s H&S guidelines

Beam Soffit Level

Ensure minimum 4 no. nails fixed through hanger into incoming joist • Approved face fix hangers fixed through all nail holes • Refer to approved metalwork supplier’s literature for further information

#SJDLDPVSTF may be required XIFSFTUFFMJT TIBMMPXFSUIBO JODPNJOHKPJTU

Approved masonry hangers built into CFEKPJOU

t %POPUöYKPJTUTUPTUFFMMJOUFMT unless approved by lintel manufacturer t #PUUPNPGIBOHFSNVTUSFTUBHBJOTUCPUUPNøBOHFPGTUFFMCFBN t 3FGFSUPBQQSPWFENFUBMXPSLTVQQMJFSTMJUFSBUVSFGPS further information

RESTRAINT STRAPS ARE THE RESPONSIBILITY OF THE BUILDING DESIGNER

F31

JOIST TO STEEL BEAM TOP FIXING

5JNCFSQBDLJOHöYFEUP #VJMEJOH%FTJHOFSTEFUBJM

F32

JOIST BEARING ON PARTY WALL

0WFSBMMNJOJNVNUIJDLOFTTPGTPMJE SJNCPBSEBOECMPDLJOHUPCFNN

5JNCFSQBDLJOH QJFDFöUUFENN QSPVEPGJOTJEFGBDF PGTUFFMøBOHF "QQSPWFEUPQöY IBOHFSTFDVSFE UISPVHITQFDJöFE OBJMIPMFT t #PUUPNPGøBOHFNVTUSFTUBHBJOTU CPUUPNøBOHFPGTUFFMCFBN t %POPUöYKPJTUTUPTUFFMMJOUFMTVOMFTTBQQSPWFE CZMJOUFMNBOVGBDUVSFS t 3FGFSUPBQQSPWFENFUBMXPSLTVQQMJFSTMJUFSBUVSF GPSGVSUIFSJOGPSNBUJPO

%JNFOTJPO9OPU UPFYDFFEIBMG UIFNFNCFSXJEUI 5JNCFS1MZXPPE 3PDLXPPMWPJEöMMFST

t 3FGFSUP'EFUBJMOPUFToUJNCFSGSBNF TFFQBHF

t 3FGFSUPQBHFGPSQFSNJTTJCMFWFSUJDBMMPBEDBQBDJUJFT

x

27


28

INDICATIVE FLOOR DETAILING – F DETAILS

F33

F34

JOIST PARALLEL TO PARTY WALL

INDICATIVE DISPROPORTIONATE COLLAPSE JOISTS AT 90˚ TO WALL

Overall minimum thickness of solid rimboard and blocking to be 76mm

x

Dimension X not to exceed half the member width • Refer to F detail notes – timber frame (see page 28) • Refer to page 12 for permissible vertical load capacities

• Specification to Engineer’s detail • Refer to page 12 for permissible vertical load capacities

INDICATIVE DISPROPORTIONATE COLLAPSE JOISTS PARALLEL TO WALL

F35

F36

JOIST PARALLEL TO EXTERNAL WALL

Additional blocking may be required to provide adequate structural performance, to Engineer’s detail

Dimension X not to exceed half the flange width

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F37

• Refer to F detail notes – timber frame (see page 28) • Refer to page 12 for permissible vertical load capacities

FLOOR CASSETTE JOINING DETAIL

• Option A

TIMBER FRAME DETAIL NOTES 1. See Table 5 and Table 14 for vertical load capacities

• Option B

Shy

2. Rimboard thickness to timber frame kit manufacturer’s Consulting Engineer’s specification/approval

Oversail

Loose Strip

Shy

5. Fix JJI-Joist to bearing with 2 no 3.35x65mm nails, 40mm from joist end

• Option D

6. Minimum joist bearing length 45mm 7. Ensure the Building Designer is satisfied with fixing between the wall and floor

Flush Flying Deck

3. Rimboard fixed to bearing with 3.34x65mm nails at 150mm c/c 4. Secure rimboard to JJI-Joist with 2 no 3.35x65mm ring shank nails, one each to top and bottom flanges

Shy

• Option C

Flush Shy

FOR F38 SEE PAGE 18

Masonry

Timber Frame

x

General


INDICATIVE FLOOR DETAILING โ€“ F DETAILS

F39

F40

ENHANCED UPLIFT

Where JJI-Joists are used web fillers are required (see F22)

FILLER BLOCKS

All triangular optional nail holes filled to provide enhanced uplift value (see hanger manufacturers literature for further information) 300

JJI-Joist or Engineered Timber

Approved face or top fix hanger secured through specified nail holes

F41

BACKER FREE JOIST TO JOIST

300

300

300

โ€ข A continuous filler block should be utilised with multiple incoming loads โ€ข A continuous backer block could also be provided โ€ข Where continuous filler block is used, fix with 2 rows of nails at 300mm centres from both faces

F42

FIXING DOUBLE OR TREBLE JOISTS

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F43

FIXING DOUBLE JOISTS

โ€ข Refer to Approved Metalwork Supplierโ€™s Technical Literature for specification and installation guidelines

F45

MASONRY RESTRAINT HANGER DETAIL 1

/PHHJOHEXBOH NJO8x45NN  TFDVSFMZรถYFEXJUI 5x65NNTLFX OBJMJOHPSBQQSPWFEDMJQ

โ€ข Refer to Approved Metalwork Supplierโ€™s Technical Literature for specification and installation guidelines

FOR F44 SEE PAGE 18

t ++*+PJTUJOBQQSPWFENBTPOSZSFTUSBJOUUZQFIBOHFST t 3FGFSUP$VMMFO5FDIOJDBM-JUFSBUVSFGPSTQFDJรถDBUJPO BOEJOTUBMMBUJPOHVJEFMJOFT t 3FTUSBJOUTUSBQTNBZCFSFRVJSFEBSPVOEPQFOJOHTo SFGFSUP$VMMFOUFDIOJDBMMJUFSBUVSF

RESTRAINT STRAPS ARE THE RESPONSIBILITY OF THE BUILDING DESIGNER

29


30

INDICATIVE FLOOR DETAILING – F DETAILS

F46

MASONRY RESTRAINT HANGER DETAIL 2

F47

ALTERNATIVE AIRTIGHTNESS DETAIL 1

Nogging/dwang (min 38x45mm) securely fixed with 3.35x65mm skew nailing or approved clip

• JJI-Joist in approved masonry restraint type hangers • Refer to Simpson Strong-Tie technical literature for specification and installation guidelines • Restraint straps may be required around openings – refer to Simpson technical literature

• Refer to Simpson Strong-Tie Technical Literature for specification and installation guidelines • Restraint straps will be required for greater than two storeys* *Straps required on all floors

RESTRAINT STRAPS ARE THE RESPONSIBILITY OF THE BUILDING DESIGNER

F48

ALTERNATIVE AIRTIGHTNESS DETAIL 2

F49

Nogging/dwang (min 38 x 45mm) securely fixed with 3.36 x 65mm skew nailing or approved clip

JOIST BEARING ON EXTERNAL WALL LOW LOAD

18mm WPB Plywood to BS 5268-2 Section 4

JJI-Joist blocking offcuts Web of blocking material must be fully supported

• Refer to Cullen Building Products Technical Literature for specification and installation guidelines • Restraint straps will be required for greater than two storeys* *Straps required on all floors

• Refer to page 7 for permissible vertical load capacities • Alternatively use JJ-Beam blocking in lieu of JJI-Joists • JJI-Joist blocking offcuts can be of any joist width

RESTRAINT STRAPS ARE THE RESPONSIBILITY OF THE BUILDING DESIGNER F50

JOIST PARALLEL TO EXTERNAL WALL LOW LOAD

18mm WPB Plywood to BS 5268-2 Section 4

F51

JJ-Beam or other engineered timber

JJI-Joist blocking offcuts

JJI-Joist blocking sprockets 38 approx

38 approx

Minimum 3.1 x 90mm nails

Web of blocking material must be fully supported Maximum 610mm

• Refer to page 7 for permissible vertical load capacities • Alternatively use JJ-Beam blocking in lieu of JJI-Joists • JJI-Joist blocking offcuts can be of any joist width

Masonry

JOIST PARALLEL DETAIL – SPROCKETS

Timber Frame

General

Minimum 3.1 x 90mm nails

• Additional blocking may be required to Engineer’s specifications to improve: – Sound – Structural performance – Fixing • Refer to timber frame detail notes (see page 28) • Refer to page 12 for permissible vertical load capacities


ROOF DESIGN

INTRODUCTION By making the most of their long spanning capabilities, JJI-Joists are ideally suited for use in roofs. This allows the Designer the freedom to create large open room spaces without the need for additional supports.

DESIGN CONSIDERATIONS Unlike a floor design, a full roof design requires many additional considerations due to its location on the exposed envelope of the building and potentially complex geometry. Unlike floors, a roof is exposed to wind and snow loading. Loading Dead loads should be calculated for each job based on the specific roof makeup. Refer to BS 648 Weights of Building Materials or manufacturers literature for material data. Imposed Snow and Wind loads should be based on the location of the building if known or alternatively on conservative estimates. BS 6399-3 and BS 6399-2 should be used for snow and wind loading respectively. Joist Stability Roofs should be braced during the erection process. Refer to temporary erection bracing notes. (See page 20.) The compression flange of the JJI-Joist requires lateral restraint at regular centres to prevent lateral buckling. This can be achieved by using a permanent structural sarking layer directly fixed to the joist, or alternatively by battens/firring strips fixed perpendicular to each joist. Where a wind load analysis indicates that the rafters will experience a stress reversal under wind suction loads, care should be taken to ensure that the bottom flange of the joist is suitably restrained. This can be achieved by, for example, directly applying a ceiling/soffit lining to the underside of the joists.

Blocking or Cross-bracing (see Roof Detail R10) may be required at support locations unless joists are held in place by alternative means. Building Stability Lateral restraint to gable walls etc. can be provided using details similar to those used for floors. Racking of the whole roof structure should be prevented by the use of structural sarking or a system of triangulated bracing (this is required where only felt and tiling battens are used). Deflection Limits When considering member deflection a maximum limit of 0.003 x span is recommended. When a finished ceiling is applied to the underside of the roof, for long spans, the designer should consider restricting the maximum deflection further to avoid damage to the finishing. The designer should also consider a more strict deflection limit for principal members such as ridge beams and purlins to minimise combined deflection. Fixings Fixing JJI-Joists to supports needs careful consideration to account for axial, tangential, horizontal and vertical loads. Particular care should be taken when considering uplift forces due to wind suction. Responsibilities A full roof design will address all the above issues, however, they may be dealt with by different parties (Roof Component Designer, Roof Designer, Building Designer). It is vital that the responsibility of each party is clearly defined at the start of the design process.

31


32

JJI-JOIST FLAT ROOFS

JJI-JOIST FLAT ROOFS •

Dead Load should take account of all components of the roof makeup including ceiling linings

The calculation of the spans includes a load sharing factor

Adequate lateral restraint to the top flange of the joists is assumed to be provided by the roof deck

Imposed Load 0.75kN/m2 (Snow)

Deflection limit 0.003 x span

The joists are designed using the principles of BS 5268-2

Joist design includes a 0.9kN Man Load check at mid span

Where the load conditions are different to those described above, refer to the JJI-Joist supplier for further assistance Dead load up to 1.00kN/m2

Dead load up to 0.75kN/m2

Joist Centres (mm)

Joist Centres (mm)

Joist Type 300

400

480

600

300

400

480

600

JJI 145 A+

3242

3071

2956

2808

3071

2887

2765

2611

JJI 195 A+

4681

4407

4216

3874

4407

4121

3936

3650

JJI 195 B+

5339

5006

4673

4288

5007

4664

4404

4036

JJI 195 C

5718

5286

4931

4521

5351

4974

4645

4253

JJI 195 D

6627

5948

5542

5072

6174

5603

5214

4764

JJI 220 A+

5320

4992

4667

4291

4998

4664

4405

4046

JJI 220 B+

6149

5606

5235

4808

5752

5291

4937

4528

JJI 220 C

6456

5831

5443

4997

6031

5502

5132

4704

JJI 220 D

7230

6491

6053

5548

6826

6119

5701

5217

JJI 235 A+

5675

5257

4916

4522

5325

4965

4641

4265

JJI 235 B+

6537

5893

5505

5058

6110

5564

5193

4766

JJI 235 C

6823

6136

5730

5263

6412

5792

5404

4957

JJI 235 D

7607

6833

6375

5847

7184

6444

6006

5501

JJI 245 A+

5905

5428

5077

4672

5537

5130

4794

4407

JJI 245 B+

6743

6069

5671

5213

6330

5731

5351

4913

JJI 245 C

7041

6334

5917

5436

6655

5980

5581

5121

JJI 245 D

7861

7063

6591

6047

7425

6662

6212

5691

JJI 300 A+

7042

6351

5944

5475

6664

6005

5617

5169

JJI 300 B+

7799

7027

6573

6049

7377

6641

6207

5707

JJI 300 C

8214

7398

6917

6363

7768

6990

6530

6001

JJI 300 D

9225

8299

7752

7122

8719

7835

7313

6710

*JJI 350 A+

7832

7068

6618

6101

7414

6686

6257

5763

*JJI 350 B+

8592

7749

7252

6680

8131

7327

6853

6307

JJI 350 C

9302

8384

7842

7219

8800

7924

7407

6811

JJI 350 D

10345

9314

8706

8005

9781

8798

8217

7548

*JJI 400 A+

8707

7861

7363

6790

8244

7438

6963

6416

*JJI 400 B+

9546

8613

8063

7431

9036

8146

7622

7018

JJI 400 C

10443

9416

8810

8113

9881

8901

8324

7658

JJI 400 D

11310

10191

9530

8770

10698

9630

9000

8273

*JJI 450 A+

9550

8625

8080

7454

9044

8162

7643

7046

*JJI 450 B+

10463

9444

8843

8153

9906

8934

8361

7702

*JJI 450 C

10910

9844

9216

8494

10327

9311

8712

8022

JJI 450 D

11910L

10917

10214

9405

11457

10320

9650

8877

Table 18. Maximum Engineering Span For JJI-Joist Flat Roofs

CORRECT

Notes for Table 18: 1.

These tables serve as guidance only. For a more detailed JJI-Joist appraisal contact a JJI-Joist Distributor

2.

To achieve the stated spans, adequate JJI-Joist bearing will be required. Web stiffeners may be necessary

3.

Designs based on a dead load as shown + 0.75kN/m2 imposed snow load

4.

Permissible web holes to be drilled in accordance with JoistMaster software

5.

Design in accordance with BS 6399-3–4.3.1 (Minimum imposed load on roof with no access)

6.

No allowance for rafter overhangs within tables

Engineering Span

7.

Figures followed by L denote engineering spans limited by the maximum manufactured JJI-Joist length of 12m

8.

* The top and bottom flanges of these sizes require continuous lateral restraint at a maximum of 300mm centres unless a lateral buckling check has been performed

9.

No wind allowance has been considered in this table


JJI-JOIST PITCHED RAFTERS

JJI-JOIST PITCHED RAFTERS

DEFINITION OF ENGINEERING SPAN FOR RAFTERS

Support Requirements When designing a JJI-Joist pitched rafter the Designer should ensure that there are at least two vertical supports under the rafter. Typically these would be a load bearing wall or ridge beam at the top end and a load bearing wall at the lower end. Additional intermediate supports may be provided by, for example, purlins.

2m x=1 L ma

It is possible to design the rafters with only one support at the lower end if the top end (Ridge) is resting on another rafter leaning in the opposite direction. This, however, leads to horizontal reactions at the lower end and higher axial loads that need to be considered by a qualified Engineer.

Joist Type

Engineering span measured on plan

Dead load up to 0.5kN/m2

Dead load up to 1.5kN/m2

Dead load up to 1.0kN/m2

15˚

30˚

45˚

15˚

30˚

45˚

15˚

30˚

45˚

JJI 145 A+

3022

2868

3045

2568

2437

2527

2286

2170

2223

JJI 195 A+

4095

3915

3991

3594

3418

3325

3230

3046

2937

JJI 195 B+

4538

4343

4437

3975

3784

3691

3590

3410

3255

JJI 195 C

4789

4585

4691

4190

3991

3898

3780

3593

3434

JJI 195 D

5383

5160

5295

4696

4479

4389

4225

4022

3858

JJI 220 A+

4532

4331

4408

3983

3786

3677

3609

3422

3252

JJI 220 B+

5085

4863

4961

4459

4243

4131

4033

3828

3647

JJI 220 C

5287

5058

5164

4633

4410

4298

4187

3976

3792

JJI 220 D

5880

5631

5764

5140

4898

4787

4635

4407

4216

JJI 235 A+

4774

4560

4638

4198

3989

3872

3806

3607

3425

JJI 235 B+

5347

5112

5210

4693

4463

4342

4247

4030

3836

JJI 235 C

5566

5323

5429

4881

4644

4522

4415

4190

3992

JJI 235 D

6192

5927

6061

5419

5161

5038

4891

4647

4440

JJI 245 A+

4930

4709

4786

4337

4120

3997

3934

3728

3538

JJI 245 B+

5508

5265

5363

4837

4599

4471

4380

4154

3952

JJI 245 C

5747

5495

5602

5043

4796

4667

4563

4329

4122

JJI 245 D

6402

6127

6261

5606

5337

5207

5062

4809

4591

JJI 300 A+

5772

5509

5589

5086

4828

4675

4620

4374

4143

JJI 300 B+

6383

6096

6195

5617

5335

5175

5095

4827

4580

JJI 300 C

6718

6418

6528

5907

5613

5449

5354

5075

4820

JJI 300 D

7529

7199

7339

6607

6284

6115

5978

5673

5401

*JJI 350 A+

6429

6133

6215

5672

5381

5203

5157

4879

4615

*JJI 350 B+

7044

6725

6823

6208

5893

5706

5639

5338

5057

JJI 350 C

7615

7272

7388

6703

6367

6173

6083

5762

5465

JJI 350 D

8455

8080

8224

7430

7062

6861

6731

6382

6066

*JJI 400 A+

7152

6821

6907

6313

5988

5786

5744

5433

5134

*JJI 400 B+

7833

7474

7577

6907

6554

6341

6279

5942

5623

JJI 400 C

8555

8167

8292

7536

7155

6931

6842

6479

6140

JJI 400 D

9255

8840

8395L

8143

7735

7504

7385

6998

6642

*JJI 450 A+

7848

7484

7574

6932

6573

6347

6219

5967

5636

*JJI 450 B+

8590

8195

8303

7580

7191

6952

6894

6521

6167

*JJI 450 C

8952

8542

8422

7895

7492

7247

7178

6792

6427

JJI 450 D

9919

9470

8395L

8736

8294

8037

7931

7510

7119

Table 19. Maximum Engineering Span For Pitched Rafters @ 600mm c/c

For Notes see Page 34

33


34

JJI-JOIST PITCHED RAFTERS

Joist Type

Dead load up to 0.5kN/m2

Dead load up to 1.5kN/m2

Dead load up to 1.0kN/m2

15˚

30˚

45˚

15˚

30˚

45˚

15˚

30˚

45˚

JJI 145 A+

3256

3093

3526

2841

2695

2939

2569

2437

2597

JJI 195 A+

4704

4441

4610

4047

3816

3854

3640

3431

3416

JJI 195 B+

5285

5047

5130

4580

4317

4284

4097

3862

3792

JJI 195 C

5583

5334

5427

4885

4605

4529

4358

4108

4006

JJI 195 D

6291

6016

6136

5519

5250

5111

4975

4692

4513

JJI 220 A+

5260

5019

5087

4578

4309

4258

4109

3867

3777

JJI 220 B+

5913

5646

5732

5208

4939

4791

4685

4408

4244

JJI 220 C

6153

5876

5969

5416

5144

4987

4895

4607

4416

JJI 220 D

6857

6553

6670

6025

5728

5564

5459

5176

4920

JJI 235 A+

5538

5283

5351

4872

4582

4481

4369

4108

3976

JJI 235 B+

6214

5931

6017

5476

5198

5032

4967

4670

4460

JJI 235 C

6473

6179

6273

5701

5413

5244

5176

4887

4646

JJI 235 D

7215

6893

7011

6345

6028

5852

5752

5452

5177

JJI 245 A+

5717

5452

5521

5047

4759

4625

4536

4263

4105

JJI 245 B+

6398

6105

6192

5641

5353

5181

5126

4832

4593

JJI 245 C

6680

6377

6471

5885

5588

5411

5345

5061

4795

JJI 245 D

7456

7122

7241

6560

6232

6046

5949

5637

5351

JJI 300 A+

6683

6371

6442

5908

5600

5402

5381

5086

4799

JJI 300 B+

7401

7058

7146

6534

6197

5986

5946

5623

5313

JJI 300 C

7795

7436

7533

6878

6525

6307

6255

5918

5596

JJI 300 D

8752

8355

8422L

7712

7321

7089

7004

6631

6282

*JJI 350 A+

7435

7085

7157

6577

6232

6006

5996

5664

5339

*JJI 350 B+

8155

7775

7862

7209

6833

6593

6566

6206

5856

JJI 350 C

8828

8419

8422L

7796

7392

7140

7096

6710

6339

JJI 350 D

9816

9365

8422L

8658

8215

7946

7871

7448

7046

*JJI 400 A+

8265

7875

7951

7316

6930

6676

6672

6301

5936

*JJI 400 B+

9061

8636

8422L

8013

7594

7322

7303

6900

6508

JJI 400 C

9911

9449

8422L

8757

8303

8014

7975

7539

7116

JJI 400 D

10733

10237

8422L

9476

8987

8422L

8622

8154

7706

*JJI 450 A+

9066

8637

8422L

8028

7603

7321

7325

6916

6512

*JJI 450 B+

9933

9465

8422L

8788

8326

8024

8012

7569

7133

*JJI 450 C

10357

9870

8422L

9160

8679

8369

8348

7888

7437

JJI 450 D

11492

10314L

8422L

10153

9626

8422L

9245

8740

8251

Table 20. Maximum Engineering Spans for JJI-Joist Pitched Rafters @ 400mm c/c Notes for Tables 19 and 20: 1.

These tables serve as guidance only. For a more detailed JJI-Joist appraisal contact a JJI-Joist Distributor

2.

To achieve the stated spans, adequate JJI-Joist bearing will be required. Web stiffeners may be necessary

3.

Figures followed by L denote engineering spans limited by the maximum manufactured JJI-Joist length of 12m

4.

Designs based on the dead load as shown + 0.75kN/m2 imposed snow load up to 30° pitch reducing linearly thereafter to zero at 60° pitch (additional imposed loads may apply – seek Roof Designer guidance)

5.

For roof pitches of 30° or less a short term man load of 0.9kN is applied to the middle of the rafter span to account for construction and maintenance loading.

6.

Spans assume the rafter top flange is laterally restrained at maximum 400mm c/c using battens or rigid sarking

For steeper pitches it is assumed that a roof ladder would spread the load 7.

Permissible web holes to be drilled in accordance with JoistMaster software

8.

Design in accordance with BS 6399-3-4.3.1 (Minimum imposed load on roof with no access)

9.

No allowance for rafter overhangs within table

10. * The top and bottom flanges of these sizes require continuous lateral restraint at a maximum of 300mm centres unless a lateral buckling check has been performed 11. No wind allowance has been considered in this table


INDICATIVE ROOF DETAILING – R DETAILS

EXAMPLE JJI-JOIST ROOF SYSTEM Bracing provided by rigid sarking

Permanent bracing to roof designer’s specification

R6 R9

Diagonal metal strap bracing

R8 R7

R11 R3

R2 R5

For any construction situation not addressed by the following roof details, please contact the JJI-Joist Distributor

R1

R4

BEARING LENGTHS

R2

BIRDSMOUTH CUT

Permitted at low end of joist only

Minimum End Bearing

Minimum Intermediate Bearing

89mm*

JJI-Joist flange must bear fully on plate

45mm*

* Minimum bearing required by JOIST DESIGN. Consult Building/ Roof Designer for building stability requirements

• Bevelled ply/timber web stiffener each side of JJI-Joist web. Fix in accordance with detail F22 • Do not bevel cut the JJI-Joist past the inside face of wall • Blocking omitted for clarity

35


INDICATIVE ROOF DETAILING – R DETAILS

R3

BEVELLED SUPPORT PLATE FOR PITCHES UP TO 45˚

R4

ADJUSTABLE SEAT CONNECTOR FOR PITCHES 15˚– 45˚

JJI-Joist or JJ-Beam blocking panel (See R10 for ventilation holes)

JJI-Joist or JJ-Beam blocking panel (See R10 for ventilation holes)

Approved connector, e.g. Cullen ACE or Simpson VPA

Maximum overhang to be 1/3 of adjacent span. If overhang to be modified use detail R5

LOOSE TIMBER OVERHANGS

R6

Solid timber overhang for soffit supports

12 ma00m x m

R5

Maximum overhang to be 1/3 of adjacent span. If overhang to be modified, then maximum 600mm

DOWNSTAND RIDGE BEAM Restraint Strap (Cullen S or Simpson LSTA)

Double bevelled support plate

Filler

JJI-Joist/JJ-Beam ridge beam or support wall

Bevelled solid timber block

18x200mm OSB splice block one side only, fix with 6 no. 3.35x65mm nails, clenched (optional)

60 ma0mm x

36

Bevelled web stiffeners on both sides if joist birdsmouthed over wallplate

R7

FLUSH RIDGE BEAM

Restraint Strap (Cullen S or Simpson LSTA)

JJI-Joist/JJ-Beam blocking panels (For ventilation guidance, see detail R10)

R8

OPENING IN ROOF

JJ-Beam Ridge Beam Filler block fixed in accordance with F15 and F21

Approved sloped hanger (Cullen ARC or Simpson LSSU)

Ply/timber bevelled web stiffener required on each face. Fix in accordance with F22

Backer block fixed in accordance with F15 and F21

Restraint Strap (Cullen S or Simpson LSTA)

Full depth face fix hanger (See detail F14 and F21)


INDICATIVE ROOF DETAILING – R DETAILS

R9

GABLE LADDER

Double joist may be required when L exceeds JJI-Joist spacing (S)

R10

Outrigger notched and nailed around JJI-Joist flange, spacing not to exceed 600mm

Gable wall panel

1/3

Maximum overhang same as rafter spacing L

S

BLOCKING AND VENTILATION HOLES 1/3

1/3

1/3

Maximum permissible ventilation V-cut for solid blocking 1/3 1/3 1/3 1/3 1/3 1/3

Braced by Simpson HSA or Cullen TJS straps

Maximum permissible hole zone for round, square or rectangular holes Vertical JJ-Beam blocking panels may be site trimmed to match JJI-Joist depth at outer edge of wall or positioned on wall to match JJI-Joist depth

R12

Restraint Strap (Cullen S or Simpson LSTA)

1/2 1/2

Maximum permissible ventilation hole in JJI-Joists blocking

Solid timber blocking pieces to suit or blockwork built up

FLUSH PURLIN BEAM

1/3

2/3

Alternatively, gable ladder to be made from JJI-Joists

R11

1/3

RAFTER FIXING TO WALL PLATE

Framing Anchor

JJ-Beam Purlin or equivalent

Twisted restraint strap

Full depth face fix hanger (See detail F18)

Approved angle bracket connector fixed to both sides of joist

Ply/timber bevelled web stiffener required on each face. Fix in accordance with F22

• Roof connectors to be determined by Roof Designer

R13

RAFTER TERMINATING ON DOWNSTAND RIDGE BEAM

Double bevelled support plate

Fixing of rafter to support plate to Building Designer’s specification

R14

RAFTER TERMINATING ON DOWNSTAND STEEL BEAM

Bevelled bearing timber attached to top of steel as per Building Designers specification

Strap nailed to the side face of bottom flange and face of void filler

JJI-Joist/JJ-Beam blocking panels (For ventilation guidance, see detail R10)

Approved restraint strap (Cullen RST2 or Simpson H10T15)

Timber void filler required. Fixing to Building Designer’s specification

JJI-Joist/JJ-Beam ridge beam or support wall • One strap required on each side of the rafter bottom flange

37


38

WALL DESIGN

INTRODUCTION JJI-Joists are ideally suited for use as wall studs where their availability in depths up to 450mm allows designers to insulate external walls to unprecedented levels. Even when shallower joists are used the narrow web profile provides a restricted path to heat transfer (reduced repeated thermal bridging) when compared with solid timber.

DESIGN CONSIDERATIONS Where the wall is subjected only to horizontal wind loads with no vertical axial loads (e.g. ground level to eaves level infill panels in a portal frame structure) JJI-Joists allow very tall walls to be built using a continuous structural member. James Jones & Sons recommend that JJI-Joists are incorporated into prefabricated wall panels in order to take advantage of the improved precision and quality typically available in a factory environment. For further information on axial compression strengths please contact James Jones & Sons.

Each timber frame kit manufacturer will typically produce their own set of standard details to suit their specific production, manufacturing and technical requirements. The structural design of JJI-Joist studs should be undertaken by a suitably qualified Engineer who should pay particular attention to buckling restraint, axial load distribution between inner and outer flanges and member to member fixings. It is our recommendation that the use of JJI-Joist studs is best suited to external wall closed panel type manufacturing with a separate service zone on the inside face of the internal sheathing. It is beneficial to manufacture long panels due to the JJI-Joists being lightweight and particular care should be taken when insulating to avoid cold spots.


JJI-JOIST THERMAL PERFORMANCE

TYPICAL JJI-STUD EXTERNAL TIMBER FRAME WALL

THERMAL PERFORMANCE OF JJI-JOISTS USED IN THE EXTERNAL ENVELOPE OF A BUILDING There are many possible ways to utilise JJI-Joists in the external envelope of a building. The thermal performance of any chosen configuration and material combination should be assessed by a suitably qualified person.

1 2

The U-Value of a detail is highly dependant on the quality of the insulation material used. The key property of the insulation in this respect is the conductivity (λ– Value) which varies from material to material and across different forms and densities of the same material. A selection of common insulation materials is provided below showing the range of λ– Values indicated in the manufacturer’s literature.

Conductivity (Q–values) for some common insulation materials Cork Recycled plastic Recycled wood fibres Sheep wool Extruded Polyethylene (XPE) Wood fibres Hemp/Cotton Rock mineral wool Flax fibres Cellulose Glass mineral wool Expanded Polystyrene (EPS) Extruded Polystyrene (XPS) Polyurethane/Polyisocyanurate(PUR/PIR) Phenolic foams 0.020

3 4

5

7

8

6

9

1.

Masonry 100mm

2.

Air Cavity 50mm

3.

Wood based board 9mm

4.

JJI-Stud

5.

Insulation material

6.

Wood based board 9mm

7.

Softwood batten 38 x 25

8.

Service void

9.

Plasterboard 12.5mm

Note: Vapour barriers, breather paper and wall ties omitted for clarity

The graph below can be used to relate the U-Value for a wall based on its thickness (JJI-Joist depth) and λ– Value of the chosen insulation. 0.025

0.030

0.035

0.040

0.045

Conductivity (W/mK) Indicative U-Values for typical JJI-Stud External Wall

Notes: 1.

Values shown were obtained from a review of publicly available product information

2.

List of materials is not intended to be exhaustive

3.

These materials can be purchased in different forms (i.e slabs, batt,

4.

Always refer to manufacturer’s published data

The following illustration details the heat transference through a typical JJI-Stud wall, construction as shown above right.

U-Value (W/m2K)

roll, loose…)

0.28 0.27 0.26 0.25 0.24 0.23 0.22 0.21 0.20 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.10 0.09 0.08

Q=0.25 Q=0.030 Q=0.035 Q=0.040 Q=0.045

145

195

220

235 245

300

JJI-Joist Depth

Notes: 1.

Whilst it can be seen that the JJI-Joist web conducts more heat than the surrounding insulation, the limited cross section of the 9mm OSB web, when compared to a typical solid timber stud, greatly reduces repeated thermal bridging.

U-Values are calculated for the typical JJI-stud external wall detail (see above)

2.

All U-Values have been calculated according to BS EN ISO 6946

3.

JJI A+ studs at 600mm centres

4.

Insulation is assumed to completely fill the JJI-Joist web void

5.

Conductivity (λ-Values) are given in W/mK

. For further information on thermal performance of JJI-Joist structures please contact James Jones & Sons

39


40

INDICATIVE WALL DETAILING – W DETAILS

W1

GROUND FLOOR TO WALL JUNCTION

W2

INTERMEDIATE FLOOR TO WALL JUNCTION JJI-Joists Rimboard

JJI-Joist stud Holding down strap Bottom rail Additional bracing may be required

Soleplate DPC

JJI-Joist stud

Bottom rail

W3

EXTERNAL WALL CORNER JUNCTION

W4

EXTERNAL WALL, INVERTED CORNER

Interior face Interior face JJI-Joist stud

JJI-Joist stud

Exterior face

Exterior face

W5

W6

STRUCTURAL OPENING

INTERNAL TO EXTERNAL WALL JUNCTION Exterior face

JJI-Joist lintel

JJI-Joist stud

Interior face

Backer blocks or lining boards

Traditional timber frame stud wall

Cripple stud

JJ-Beam/EWP bottom rail

Insulation omitted for clarity

Internal wall


GLOSSARY

Backer Block Timber, plywood or OSB block nailed to web of JJI-Joist to allow fixing of joist hangers. Beam A principal member carrying other floor members. JJ-Beam and JJ-Rim A high specification Glulam beam made from laminations of strength graded timber glued together to make larger sections. Building Designer The design professional responsible for structural stability and integrity of the whole building. Compression Block Solid timber block fixed to rim joists or header joists where substantial vertical loads occur. Dead Load The self weight of the building components. Deflection Vertical deformation of a joist or beam due to the applied dead and imposed loads (see page 19). Diagonal Brace 22x97mm timber used as part of erection bracing and fixed diagonally across top of JJI-Joists. Erection Bracing Temporary bracing used to stabilise the joists during construction. Filler Block Timber block used to fix multiple JJI-Joists together. Flange The timber component at the top and bottom of a JJI-Joist. Header Joist JJI-Joist section used on the perimeter of a building parallel to the span of the joists. Imposed Load The load due to the occupancy of the building. Often referred to as live load. JJI-Joist A structural timber composite formed in the shape of an I-section. Longitudinal Binder 22x97mm timber used as part of erection bracing. OSB Oriented Strand Board, formed from wood strands glued together. Rafter A structural roof member aligned with the fall of the roof pitch. Rim Board/Rim Joist JJI-Joist or JJ-Beam section used on the perimeter of a building both parallel and perpendicular to the span of the joists. Roof Component Designer The design professional responsible for the design of the individual member (JJI-Joist rafter, JJ-Beam purlin, etc) within the roof structure.

Roof Designer The design professional responsible for the whole roof structure. Responsibilities include the overall roof stability and its capacity to transmit wind forces to suitable load-bearing walls below. Serviceability Index A measure of a joist’s performance relative to the minimum Code of Practice requirement. Service Hole A hole formed in the web of a JJI-Joist in accordance with prescribed rules. Stability Blocks Solid timber blocks fixed at the ends of JJI-Joists as part of stability bracing where the joists are not built into walls or fixed in hangers. Wall Stud A vertical structural member forming part of a wall. Web The OSB component of a JJI-Joist that separates the flanges. Web Stiffener Timber, plywood or OSB block nailed to the web of JJI-Joists where large reactions or applied loads occur.

41


U E

B

G YOUR FU T

R

U

IN IL D

W ITH ISE T BRIT R ISH EXPE

JJI-Joists Distribution

JJI-Joists, JJ-Beam and associated connection hardware are readily available through a national network of specialists who have staff specifically trained in the design and installation of JJI-Joist systems. •

JJI-Joist Distributors are specifically chosen because of their professionalism and close relationships with builders

JJI-Joist Distributors are strategically located throughout the UK and Ireland

Stocks of JJI-Joists are held by all JJI-Joist Distributors

Distributors employ technical staff who are trained in the use of JoistMaster and FloorMaster programs

Deliveries and lead times are kept to a minimum due to the location of the JJI-Joist Distributor and the production facility being based in the UK

Many JJI-Joist Distributors have several depots each with trained staff capable of nationwide distribution

JJI-Joists Technical Manual is also available in French and Dutch languages

For further details please contact:

Timber Systems Division Greshop Industrial Estate Forres Scotland IV36 2GW t: + 44 (0)1309 671111 f: + 44 (0)1309 671720 e: jji-joists@jamesjones.co.uk w: www.jamesjones.co.uk

Revised December 2013

Techmanual december 2013 website  

How to design and install JJI-Joists, the UK's leading engineered I-Beam and the only UK produced I-Joist to have FSC certification.